late 15c., "place where four ways meet," from Old French carrefor (13c., quarrefour), from Latin quadrifurcus "four-forked," from quatuor "four" (see four) + furca "fork" (see fork (n.)). "Formerly quite naturalized, but now treated only as French" [OED]. Englished variant carfax is from Middle English carfourkes.[carrefour etymology, carrefour origin, 英语词源]