icu4c/source/data/region/gv.txt

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
// Generated using tools/cldr/cldr-to-icu/build-icu-data.xml
gv{
    Countries{
        GB{"Rywvaneth Unys"}
        IM{"Ellan Vannin"}
    }
}