diff --git a/data/LanguageNameIndexer.php b/data/LanguageNameIndexer.php
index a8b25199..c01a3d92 100644
--- a/data/LanguageNameIndexer.php
+++ b/data/LanguageNameIndexer.php
@@ -120,6 +120,8 @@ class LanguageNameIndexer extends Maintenance {
 			'mui' => [ 'musi palembang' ],
 			// Western Punjabi, doesn't start with the word "Punjabi" in any language
 			'pnb' => [ 'punjabi western' ],
+			// Tai Nuea (T367377)
+			'tdd' => [ 'ᥖᥭᥰᥖᥬᥳᥑᥨᥒᥰ' ],
 			// Simplified and Traditional Chinese, because zh-hans and zh-hant
 			// are not mapped to any English name
 			'zh-hans' => [ 'chinese simplified' ],
diff --git a/data/LanguageNameSearchData.php b/data/LanguageNameSearchData.php
index 6b245cd9..c773497a 100644
--- a/data/LanguageNameSearchData.php
+++ b/data/LanguageNameSearchData.php
@@ -66706,6 +66706,7 @@ class LanguageNameSearchData {
 				'ᠮᠣᠩᠭᠣᠯ' => 'mvf',
 				'ᠰᡞᠪᡝ ᡤᡞᠰᡠᠨ' => 'sjo',
 				'ᥖᥭᥰ ᥖᥬᥲ ᥑᥨᥒᥰ' => 'tdd',
+				'ᥖᥭᥰᥖᥬᥳᥑᥨᥒᥰ' => 'tdd',
 				'ᨅᨔ ᨕᨘᨁᨗ' => 'bug-bugi',
 				'ᨆᨀᨔᨑ' => 'mak-bugi',
 				'ᨣᩤᩴᨾᩮᩬᩥᨦ' => 'nod',