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Last name קוסטין (Costin , קוסטין ) , in all the world, is a common family name. The cognomen קוסטין is characteristic of Romania, where it is quite a common surname, Moldova, and Israel, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Romania, the United States, and Moldova. Likewise, קוסטין is the forename as well as the last name.