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Cognomen Karoly (Károly , Karoly , Карой ) , all around the world, is quite a common last name. The cognomen Karoly is characteristic of Hungary, where it is quite a common surname, Romania, where it is quite a rare surname, and Serbia. Not in comparison with a country's population, it most frequently occurs in Hungary, Romania, and the United States. Likewise, Karoly is the forename as well as the last name.