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All over the world, Siewert (Siewert , Зиверт ) is a very rare boy's given name. The first name Siewert is habitual in Sweden, where it is a rare male name, Germany, where it is a very rare boy's name, and South Africa. More prevalently, Siewert is the last name as well as the forename.
Siewert is also a name for the fictitious and mythical characters: Sievert Tiburtius , the character from Thomas Mann's Buddenbrooks.