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Across the world, Oster (Oster , Остер , Oust ) is a rare gender-neutral given name. The first name Oster is habitual in the Democratic Republic of the Congo, where it is a rare boy's name, Tanzania, where it is a very rare female name, and Peru, where it is a very rare male name. Not in comparison with a country's population, it is the most numerous in the Democratic Republic of the Congo, China, and Tanzania. Much more prevalently, Oster is the last name as well as the forename.