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The term Frank in eastern Mediterranean countries was used, in various vernacular forms, to denote the Crusaders and their descendants, and the American surname may also be an Americanized form of such a form.English, Dutch, German, etc.: from the personal name Frank, in origin an ethnic name for a Frank.
one of the Germanic people that conquered Celtic Gaul from the Romans c.500 C.E. and made it into France, from Frankish *Frank (cf. Old High German Franko, Old English Franca).