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Cognomen Siebert (Siebert , Sibert , Зиберт ) , throughout the world, is a common last name. The family name Siebert is characteristic of Germany, where it is quite a common surname, Namibia, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and France. Very seldom, Siebert is the forename as well as the last name.