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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.
The surname Franz was first found in the Rhineland, where the family emerged in mediaeval times as one of the notable families of the region. From the 13th century the surname was identified with the great social and economic evolution which made this territory a landmark contributor to the development of the nation.