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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.
German, Dutch, Scandinavian, Slovenian, Czech, Hungarian, and Jewish (Ashkenazic): ethnic or regional name for someone from Franconia (German Franken), a region of southwestern Germany so called from its early settlement by the Franks, a Germanic people who inhabited the lands around the river Rhine in Roman times.