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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.
Born in Frankfurt, Germany, she lived most of her life in or near Amsterdam, Netherlands, having moved there with her family at the age of four-and-a-half when the Nazis gained control over Germany. Born a German national, Frank lost her citizenship in 1941 and thus became stateless.