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Cognomen Ostman (Ostman , Östman , Остман ) , throughout the world, is quite a common last name. The cognomen Ostman is habitual in Northern Europe, particularly Sweden, where it is quite a common surname, Finland, and Norway, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Sweden, Finland, and the United States. Very seldom, Ostman is the forename as well as the last name.