diff --git a/icu4c/source/data/locales/kw.txt b/icu4c/source/data/locales/kw.txt
index 698f784280a..94365011d5e 100644
--- a/icu4c/source/data/locales/kw.txt
+++ b/icu4c/source/data/locales/kw.txt
@@ -31,7 +31,7 @@ kw{
         "Mer",
         "Ebr",
         "Me",
-        "Evn",
+        "Efn",
         "Gor",
         "Est",
         "Gwn",
@@ -45,7 +45,7 @@ kw{
         "Mys Merth",
         "Mys Ebrel",
         "Mys Me",
-        "Mys Evan",
+        "Mys Efan",
         "Mys Gortheren",
         "Mye Est",
         "Mys Gwyngala",
diff --git a/icu4c/source/data/locales/kw_GB.txt b/icu4c/source/data/locales/kw_GB.txt
index a6520d6d4ce..6881a967495 100644
--- a/icu4c/source/data/locales/kw_GB.txt
+++ b/icu4c/source/data/locales/kw_GB.txt
@@ -22,10 +22,10 @@ kw_GB {
         "HH:mm:ss",
         "HH:mm:ss",
         "HH:mm",
-        "EEEE dd MMMM yyyy",
-        "dd MMMM yyyy",
-        "MMM dd,yy",
-        "dd/MM/yy",
+        "EEEE d MMMM yyyy",
+        "d MMMM yyyy",
+        "d MMM yyyy",
+        "dd/MM/yyyy",
         "{1} {0}",
     }
     NumberPatterns {