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Throughout the world, Siebert (Siebert , Sibert , Зиберт ) is a rare masculine given name. The forename Siebert is habitual in South Africa, where it is a rare male name, Belgium, and Germany, where it is a very rare principally male, but scarcely girly name. Not in comparison with a country's population, it is commonest in South Africa, Germany, and the United States. Much more prevalently, Siebert is the last name as well as the forename.