Cognomen Siewerdt (Siewerdt 
) , worldwide, is a rare last name. The surname Siewerdt is characteristic of Brazil, where it is a rare surname, Germany, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Siewerdt | Germany, Brazil, United States |
| friedrich adolf siewerdt (1837-1901), CH (b. 1837) |
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| arthur siewerdt BR (b. 1901) |
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| lotar siewerdt brazilian scientist (b. 1939) |
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| arno siewerdt BR (b. 1934) |
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Mr, Joao, Jean, Tays, Nair, Elsa, Elke, Elfi, Erna, Enzo, Egon, Eber, Fred, Ilse, Ivan, Maria, Mario, Marli, Miria, Sueli, Sonia, Aline, Joni, John, Jose, Ludi, Ms, Ana, Ari, Eno, Ivo, Mara, Sido, Arno, Adir, Caio, Alida, Cris, Kaua, Raul, Ralf, Rosa, Rolf, Lais, Lino, Lony, Luis, Luiz, Karl, and Andre