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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 Griego came from the Italian personal name Greca, which is derived from the Latin word graecus, which means greek. Alternatively, the surname is of a nickname origin that was given to one who came from Greece.