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Surname Костин (Costin , Kostin , Костин ) , across the world, is a common cognomen. The family name Костин is characteristic of Romania, where it is quite a common surname, Moldova, and Aland Islands (explore the name in all countries). Not in comparison with a country's population, it most frequently occurs in Russia, Romania, and the United States. Much less frequently, Костин is the forename as well as the last name.