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Cognomen Koshar (Koshar , Кошар ) , across the world, is quite a rare family name. The surname Koshar is characteristic of Belarus, where it is quite a rare surname, Bulgaria, where it is a rare surname, and India. Not in comparison with a country's population, it most frequently occurs in India, the United States, and Belarus. More prevalently, Koshar is the forename as well as the last name.