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Family name Rosten (Rosten , Rostir , Ростен ) , all over the world, is quite a rare last name. The last name Rosten is characteristic of Northern Europe, particularly Norway, where it is quite a rare surname, Finland, and Sweden, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, Norway, and Finland. Much less frequently, Rosten is the forename as well as the last name.