diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/DictionaryTest.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/DictionaryTest.php
index 363f84627350f..bc299053bd4fe 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/DictionaryTest.php
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/DictionaryTest.php
@@ -63,7 +63,9 @@ public function dictionaryDataProvider()
             // Second case with inheritance of package with the same language code
             'a case with inheritance similar language code' => $this->getDataInheritanceWitSimilarCode(),
             // Third case with circular inheritance, when two packages depend on each other
-            'a case with circular inheritance' => $this->getDataCircularInheritance()
+            'a case with circular inheritance' => $this->getDataCircularInheritance(),
+            // Fourth case with multiple inheritance from dev docs
+            'a case with multiple inheritance from dev docs' => $this->getDataMultipleInheritanceFromDevDocs()
         ];
     }
 
@@ -113,7 +115,7 @@ private function getDataCircularInheritance()
     {
         return [
             // Dictionary that will be requested
-            'language_code' => 'en_US',
+            'language_code' => 'en_AZ',
             // Expected merged dictionary data
             'expectation' => [
                 'one' => '1.0',
@@ -123,4 +125,48 @@ private function getDataCircularInheritance()
             ]
         ];
     }
+
+    /**
+     * If a language package inherits from two packages:
+     * ...
+     *  <code>en_AK</code>
+     * ...
+     *  <use vendor="parent-package-one" package="language_package_one"/>
+     *  <use vendor= "parent-package-two" package="language_package_two"/>
+     * ...
+     *
+     * In the preceding example:
+     *  language_package_one inherits from en_au_package and en_au_package inherits from en_ie_package
+     *  language_package_two inherits from en_ca_package and en_ca_package inherits from en_us_package
+     *
+     * If the Magento application cannot find word or phrase in the en_AK package,
+     * it looks in other packages in following sequence:
+     *  parent-package-one/language_package_one
+     *  <vendorname>/en_au_package
+     *  <vendorname>/en_ie_package
+     *  parent-package-two/language_package_two
+     *  <vendorname>/en_ca_package
+     *  <vendorname>/en_us_package
+     *
+     * @return array
+     */
+    private function getDataMultipleInheritanceFromDevDocs()
+    {
+        return [
+            // Dictionary that will be requested
+            'language_code' => 'en_AK',
+            // Expected merged dictionary data
+            'expectation' => [
+                'one' => 'en_us_package_one',
+                'two' => 'en_ca_package_two',
+                'three' => 'language_package_two_three',
+                'four' => 'en_ie_package_four',
+                'five' => 'en_au_package_five',
+                'six' => 'language_package_one_six',
+                'seven' => 'en_ak_seven',
+                'eight' => 'en_ak_eight',
+                'nine' => 'en_ak_nine',
+            ]
+        ];
+    }
 }
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/a.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/a.csv
similarity index 100%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/a.csv
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/a.csv
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/b.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/b.csv
similarity index 100%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/b.csv
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/b.csv
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/language.xml
similarity index 86%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/language.xml
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/language.xml
index a4c5630d5fcd9..3cc5d8965c2e8 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/language.xml
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/language.xml
@@ -6,8 +6,8 @@
 */
 -->
 <language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
-    <code>en_US</code>
+    <code>en_AZ</code>
     <vendor>bar</vendor>
-    <package>en_us</package>
+    <package>en_az</package>
     <sort_order>0</sort_order>
 </language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/registration.php
similarity index 92%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/registration.php
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/registration.php
index 7f792bf5941ca..41e17fbcf515d 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_us/registration.php
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_az/registration.php
@@ -6,4 +6,4 @@
 
 use Magento\Framework\Component\ComponentRegistrar;
 
-ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'bar_en_us', __DIR__);
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'bar_en_az', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_gb/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_gb/language.xml
index faf531fbf5cc2..736e9dbe738d7 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_gb/language.xml
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/bar/en_gb/language.xml
@@ -10,5 +10,5 @@
     <vendor>bar</vendor>
     <package>en_gb</package>
     <sort_order>100</sort_order>
-    <use package="en_us" vendor="bar"/>
+    <use package="en_az" vendor="bar"/>
 </language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/baz/en_gb/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/baz/en_gb/1.csv
index ea501f9d96944..61ef9dd8a49b3 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/baz/en_gb/1.csv
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/baz/en_gb/1.csv
@@ -1 +1,5 @@
-four and 5/10,4.5
\ No newline at end of file
+one,1.00
+two,2.00
+three,3.00
+four,4.00
+four and 5/10,4.5
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/1.csv
new file mode 100644
index 0000000000000..8ed274ad7d886
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/1.csv
@@ -0,0 +1,3 @@
+seven,en_ak_seven
+eight,en_ak_eight
+nine,en_ak_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/language.xml
new file mode 100644
index 0000000000000..d0db854f329d0
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/language.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_AK</code>
+    <vendor>devdoc</vendor>
+    <package>en_ak</package>
+    <sort_order>0</sort_order>
+    <use vendor="parent-package-one" package="language_package_one"/>
+    <use vendor="parent-package-two" package="language_package_two"/>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/registration.php
new file mode 100644
index 0000000000000..13b498edcd0aa
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/devdoc/en_ak/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'devdoc_en_ak', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/1.csv
similarity index 100%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/1.csv
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/1.csv
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/language.xml
similarity index 88%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/language.xml
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/language.xml
index 6c67871476b5f..2b8354a70dc28 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/language.xml
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/language.xml
@@ -6,9 +6,9 @@
 */
 -->
 <language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
-    <code>en_US</code>
+    <code>en_AZ</code>
     <vendor>first</vendor>
-    <package>en_us</package>
+    <package>en_az</package>
     <sort_order>0</sort_order>
     <use package="en_gb" vendor="second"/>
 </language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/registration.php
similarity index 91%
rename from dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/registration.php
rename to dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/registration.php
index 48dfbf20c9f26..85e88eb4546ce 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_us/registration.php
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/first/en_az/registration.php
@@ -6,4 +6,4 @@
 
 use Magento\Framework\Component\ComponentRegistrar;
 
-ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'first_en_us', __DIR__);
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'first_en_az', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/1.csv
new file mode 100644
index 0000000000000..f1d7dc7c106c7
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/1.csv
@@ -0,0 +1,5 @@
+five,en_au_package_five
+six,en_au_package_six
+seven,en_au_package_seven
+eight,en_au_package_eight
+nine,en_au_package_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/language.xml
new file mode 100644
index 0000000000000..64d558d9c1d63
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/language.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-one</vendor>
+    <package>en_au_package</package>
+    <sort_order>0</sort_order>
+    <use vendor="parent-package-one" package="en_ie_package"/>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/registration.php
new file mode 100644
index 0000000000000..664a6d34a814b
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_au_package/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-one_en_au_package', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/1.csv
new file mode 100644
index 0000000000000..8c580556c2e26
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/1.csv
@@ -0,0 +1,6 @@
+four,en_ie_package_four
+five,en_ie_package_five
+six,en_ie_package_six
+seven,en_ie_package_seven
+eight,en_ie_package_eight
+nine,en_ie_package_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/language.xml
new file mode 100644
index 0000000000000..3b681d012b192
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/language.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-one</vendor>
+    <package>en_ie_package</package>
+    <sort_order>0</sort_order>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/registration.php
new file mode 100644
index 0000000000000..81ae45c3d5a40
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/en_ie_package/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-one_en_ie_package', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/1.csv
new file mode 100644
index 0000000000000..54bb6bee04f17
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/1.csv
@@ -0,0 +1,4 @@
+six,language_package_one_six
+seven,language_package_one_seven
+eight,language_package_one_eight
+nine,language_package_one_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/language.xml
new file mode 100644
index 0000000000000..4d19c728222ba
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/language.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-one</vendor>
+    <package>language_package_one</package>
+    <sort_order>0</sort_order>
+    <use vendor="parent-package-one" package="en_au_package"/>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/registration.php
new file mode 100644
index 0000000000000..0432f835f0849
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-one/language_package_one/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-one_language_package_one', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/1.csv
new file mode 100644
index 0000000000000..b3c5408b439b4
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/1.csv
@@ -0,0 +1,8 @@
+two,en_ca_package_two
+three,en_ca_package_three
+four,en_ca_package_four
+five,en_ca_package_five
+six,en_ca_package_six
+seven,en_ca_package_seven
+eight,en_ca_package_eight
+nine,en_ca_package_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/language.xml
new file mode 100644
index 0000000000000..68914dc8df672
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/language.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-two</vendor>
+    <package>en_ca_package</package>
+    <sort_order>0</sort_order>
+    <use vendor="parent-package-two" package="en_us_package"/>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/registration.php
new file mode 100644
index 0000000000000..b87032884f7db
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_ca_package/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-two_en_ca_package', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/1.csv
new file mode 100644
index 0000000000000..ef932c4326fb3
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/1.csv
@@ -0,0 +1,9 @@
+one,en_us_package_one
+two,en_us_package_two
+three,en_us_package_three
+four,en_us_package_four
+five,en_us_package_five
+six,en_us_package_six
+seven,en_us_package_seven
+eight,en_us_package_eight
+nine,en_us_package_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/language.xml
new file mode 100644
index 0000000000000..fa7ecda34c975
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/language.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-two</vendor>
+    <package>en_us_package</package>
+    <sort_order>0</sort_order>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/registration.php
new file mode 100644
index 0000000000000..48ed54033a96e
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/en_us_package/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-two_en_us_package', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/1.csv b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/1.csv
new file mode 100644
index 0000000000000..ef85e7dd72575
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/1.csv
@@ -0,0 +1,7 @@
+three,language_package_two_three
+four,language_package_two_four
+five,language_package_two_five
+six,language_package_two_six
+seven,language_package_two_seven
+eight,language_package_two_eight
+nine,language_package_two_nine
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/language.xml
new file mode 100644
index 0000000000000..5e72723312c68
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/language.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<!--
+/**
+* Copyright © Magento, Inc. All rights reserved.
+* See COPYING.txt for license details.
+*/
+-->
+<language xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/Language/package.xsd">
+    <code>en_US</code>
+    <vendor>parent-package-two</vendor>
+    <package>language_package_two</package>
+    <sort_order>0</sort_order>
+    <use vendor="parent-package-two" package="en_ca_package"/>
+</language>
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/registration.php b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/registration.php
new file mode 100644
index 0000000000000..f7eb7d2373a29
--- /dev/null
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/parent-package-two/language_package_two/registration.php
@@ -0,0 +1,9 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+use Magento\Framework\Component\ComponentRegistrar;
+
+ComponentRegistrar::register(ComponentRegistrar::LANGUAGE, 'parent-package-two_language_package_two', __DIR__);
diff --git a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/second/en_gb/language.xml b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/second/en_gb/language.xml
index 860e21ad009ab..12f36154efffe 100644
--- a/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/second/en_gb/language.xml
+++ b/dev/tests/integration/testsuite/Magento/Framework/App/Language/_files/second/en_gb/language.xml
@@ -10,5 +10,5 @@
     <vendor>second</vendor>
     <package>en_gb</package>
     <sort_order>0</sort_order>
-    <use package="en_us" vendor="first"/>
+    <use package="en_az" vendor="first"/>
 </language>
diff --git a/lib/internal/Magento/Framework/App/Language/Dictionary.php b/lib/internal/Magento/Framework/App/Language/Dictionary.php
index 9aaafc23c9e49..b4a6fdc1b5ce3 100644
--- a/lib/internal/Magento/Framework/App/Language/Dictionary.php
+++ b/lib/internal/Magento/Framework/App/Language/Dictionary.php
@@ -195,6 +195,10 @@ private function collectInheritedPacks($languageConfig, &$result, $level = 0, ar
      */
     private function addInheritedPacks($packs, $pack, &$sortedPacks)
     {
+        if (isset($sortedPacks[$pack['key']])) {
+            return;
+        }
+
         $sortedPacks[$pack['key']] = $pack;
         foreach ($pack['language']->getUses() as $reuse) {
             $packKey = implode('|', [$reuse['vendor'], $reuse['package']]);