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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.
This interesting surname is of Old French origin, and is an ethnic name for someone from France. The country was so named from the Franks (i.e. the free men), a confederacy of German tribes who fought with the Romans over a long period before finally settling in Gaul in the 5th Century.he first recorded spelling of the family name is shown to be that of Hugo Francus, which was dated 1135, in the Cartulary of Oseney Abbey, Oxfordshire, during the reign of King Henry 1, known as The Lion of Justice, 1100 - 1135.