1672, from L. Gallicus "pertaining to Gaul or the Gauls," from L. Gallia "Gaul" and Gallus "a Gaul" from a native Celtic name (see Gaelic), though some connect the word with prehistoric W.Gmc. *walkhoz "foreigners" (see Welsh). Originally used
in Eng. rhetorically or mockingly for "French." Gallicism "French word or idiom" is from 1656.