köken: From Middle French, from Old French gualeis (“Welsh”) (compare Old French walois (“langue d'oil”)), from Frankish *walhisk (“Roman”), from Proto-Germanic *walhiskaz (“non-Germanic, foreign”). Cognate with Old High German walahisc (“Roman”), Old English wǣlisċ, wīelisċ (“foreign, Celtic”). More at Welsh, Gaul.
köken: Etymology tree Proto-Indo-European *gelH-? Proto-Celtic *galnatibor. Latin Gallus Proto-Indo-European *-yós Proto-Italic *-ios Old Latin -ios Latin -ius Latin -ia Latin Gallialbor. Polish Galia Proto-Indo-European *-iskos Proto-Balto-Slavic *-iškas Proto-Slavic *-ьskъ Old Polish -ski Polish -ski Polish galijski From Galia + -ski.