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Family name Orestis (Orestis , Ορέστης , Орестис ) , in the world, is quite a rare surname. The last name Orestis is habitual in Greece, where it is quite a common surname, the United States, where it is a very rare surname, and Brazil, where it is an extremely rare surname. More prevalently, Orestis is the forename as well as the last name.