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Surname Koltai (Koltai ) , all over the world, is quite a rare family name. The surname Koltai is characteristic of Hungary, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Austria, where it is a rare surname. In absolute terms, it most frequently occurs in Hungary, the United States, and Germany. Very seldom, Koltai is the forename as well as the last name.