Cognomen Klettenberg (Klettenberg 
) , all over the world, is a rare surname. The cognomen Klettenberg is habitual in Estonia, where it is quite a rare surname, Brazil, where it is a rare surname, and Finland. In absolute terms, it is the most numerous in Brazil, Estonia, and the United States.
| VARIANT | COUNTRY |
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| Klettenberg | Germany, Estonia, Finland, Brazil, United States |
| johann erasmus von klettenberg (b. 1657) |
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| philipp wilhelm seiffart von klettenberg (b. 1668) |
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| carl heinrich seiffart von klettenberg DE (b. 1681) |
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| johann hektor von klettenberg DE (b. 1684) |
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| friedrich august von klettenberg (b. 1687) |
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| remigius von klettenberg (b. 1693) |
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| johann erasmus georg seiffart von klettenberg (b. 1699) |
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| decio klettenberg Brazilian rower, BR (b. 1902) |
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| kajari klettenberg Estonian military personnel, EE (b. 1966) |
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| gunnar klettenberg Estonian equestrian, EE (b. 1967) |
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| volkmar herr zu klettenberg |
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| johann erasmus seiffart von klettenberg DE |
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Mr, Marta, Maira, Siiri, Sueli, Selma, Selha, Sonia, Alice, Aline, Anita, Adair, Carla, Celio, Celso, Cleia, Cleci, Bruno, Karin, Kertu, Paulo, Pedro, Mario, Maria, Iury, Igor, Ms, Sol, Ana, Ane, Ivo, Arno, Kirk, Paul, Revo, Ruth, Rauno, Davi, Lori, Lucy, Luis, Luã, Jose, Joao, Jean, Nair, Erik, Ilze, Gene, and Renan