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Last name Oar (Oar , Óvári , Оар) , throughout the world, is quite a rare surname. The cognomen Oar is habitual in Hungary, where it is quite a rare surname, Sudan, where it is a rare surname, and Spain. In absolute terms, it most frequently occurs in the United States, Sudan, and Hungary. Much less frequently, Oar is the forename as well as the last name.