diff --git a/qt.csv b/qt.csv
index 8d97d4ab..b9e93dbe 100644
--- a/qt.csv
+++ b/qt.csv
@@ -31,7 +31,6 @@ et,Estonian,2,(n != 1)
 eu,Basque,2,(n != 1)
 fa,Persian,1,0
 fi,Finnish,2,(n != 1)
-fil,Filipino,2,(n > 1)
 fil,Filipino,3,(n==1 ? 0 : (n%10==4 || n%10==6 || n%10== 9) ? 1 : 2)
 fj,Fijian,1,0
 fo,Faroese,2,(n != 1)
@@ -51,7 +50,6 @@ hr,Croatian,3,(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%1
 hu,Hungarian,1,0
 hy,Armenian,2,(n > 1)
 ia,Interlingua,2,(n != 1)
-ia,Interlingua,2,(n != 1)
 id,Indonesian,1,0
 ik,Inupiaq,3,(n==1 ? 0 : n==2 ? 1 : 2)
 is,Icelandic,2,(n%10==1 && n%100!=11 ? 0 : 1)
diff --git a/scripts/export-qt b/scripts/export-qt
index 3f92a254..9a32de72 100755
--- a/scripts/export-qt
+++ b/scripts/export-qt
@@ -11,7 +11,7 @@ import csv
 ALIASES = {
     "Chinese": ("Chinese (Simplified Han script)", "Chinese (Traditional Han script)"),
     "WesternFrisian": ("Frisian",),
-    "Interlingue": ("Interlingua",),
+    "Interlingue": (),  # Ignore, duplicate for Interlingua
     "Khmer": ("Khmer (Central)",),
     "Kirghiz": ("Kyrgyz",),
     "NorthernSotho": ("Pedi",),
@@ -56,6 +56,9 @@ PLURALS = {}
 def handle_language(parts):
     text = "".join(parts).replace("\n", "")[31:]
     name = text.split("[", 1)[0]
+    # Remove duplicate definition
+    if name == "frenchStyleLanguages":
+        text = text.replace("QLocale::Filipino,", "")
     # Hack to deal with frenchStyleCountries
     if name == "frenchStyleLanguages":
         text = text.replace("Portuguese", "PortugueseBrasil")
@@ -103,11 +106,14 @@ with open("modules/qttools/src/linguist/shared/numerus.cpp") as handle:
             in_table = True
 
 output = []
+processed = set()
 
 
 def generate(group, name):
     definition = DEFINITIONS[name]
     plural = PLURALS[group]
+    if definition[0] in processed:
+        raise ValueError(f"Duplicate definition for {definition[0]}")
     output.append(
         (
             definition[0],
@@ -116,6 +122,7 @@ def generate(group, name):
             plural[1],
         )
     )
+    processed.add(definition[0])
 
 
 for group, languages in LANGUAGES.items():
diff --git a/scripts/lint b/scripts/lint
index d4a364fe..efcb9680 100755
--- a/scripts/lint
+++ b/scripts/lint
@@ -24,6 +24,7 @@ def parse_csv(name):
 languages = parse_csv("languages.csv")
 aliases = parse_csv("aliases.csv")
 cldr = parse_csv("cldr.csv")
+parse_csv("qt.csv")
 default_countries = parse_csv("default_countries.csv")
 
 for alias in aliases:
diff --git a/weblate_language_data/plurals.py b/weblate_language_data/plurals.py
index 79cc4825..8072453a 100644
--- a/weblate_language_data/plurals.py
+++ b/weblate_language_data/plurals.py
@@ -616,15 +616,6 @@
         2,
         "(n != 1)",
     ),
-    (
-        "fil",
-        # Translators: Language name for ISO code "fil". The parenthesis clarifies
-        # variant of the language. It could contain a region, age (Old, Middle, ...)
-        # or other variant.
-        _("Filipino"),
-        2,
-        "(n > 1)",
-    ),
     (
         "fil",
         # Translators: Language name for ISO code "fil". The parenthesis clarifies
@@ -796,15 +787,6 @@
         2,
         "(n != 1)",
     ),
-    (
-        "ia",
-        # Translators: Language name for ISO code "ia". The parenthesis clarifies
-        # variant of the language. It could contain a region, age (Old, Middle, ...)
-        # or other variant.
-        _("Interlingua"),
-        2,
-        "(n != 1)",
-    ),
     (
         "id",
         # Translators: Language name for ISO code "id". The parenthesis clarifies