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Cognomen Oster (Oster , Остер , Oust ) , across the world, is a common family name. The cognomen Oster is habitual in Germany, where it is quite a common surname, Israel, where it is quite a rare surname, and Denmark. In absolute terms, it is commonest in Germany, the United States, and France. Very seldom, Oster is the forename as well as the last name.