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Cognomen Oust (Oster , Ost , Уст ) , around the world, is a common family name. The family name Oust is habitual in Suriname, where it is quite a common surname, Germany, and Belgium, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and France. Very seldom, Oust is the forename as well as the last name.