diff --git a/icu4c/source/data/locales/root.txt b/icu4c/source/data/locales/root.txt
index e707113eea..25a49d04ff 100644
--- a/icu4c/source/data/locales/root.txt
+++ b/icu4c/source/data/locales/root.txt
@@ -548,6 +548,48 @@ root{
                 }
             }
         }
+        coptic{
+            monthNames{
+                format{
+                    wide{
+                        "Tout",
+                        "Baba",
+                        "Hator",
+                        "Kiahk",
+                        "Toba",
+                        "Amshir",
+                        "Baramhat",
+                        "Baramouda",
+                        "Bashans",
+                        "Paona",
+                        "Epep",
+                        "Mesra",
+                        "Nasie",
+                    }
+                }
+            }
+        }
+        ethiopic{
+            monthNames{
+                format{
+                    wide{
+                        "Meskerem",
+                        "Tekemt",
+                        "Hedar",
+                        "Tahsas",
+                        "Ter",
+                        "Yekatit",
+                        "Megabit",
+                        "Miazia",
+                        "Genbot",
+                        "Sene",
+                        "Hamle",
+                        "Nehasse",
+                        "Pagumen",
+                    }
+                }
+            }
+        }
     }
     delimiters{
         alternateQuotationEnd{"’"}