Cognomen Claaßen (Claaßen 
) , all over the world, is quite a rare family name. The family name Claaßen is habitual in Western Europe, particularly Germany, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Claaßen | Germany |
| hermann claaßen German chemist, PL (b. 1856) |
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| reinhard claaßen German architect (1886-1960), DE (b. 1886) |
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| siegfried claaßen (b. 1884) |
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larissa claaßen German (beach) volleyball player, DE (b. 1995) |
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| frank claaßen German association football player, DE (b. 1967) |
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| christian claaßen German footballer, DE (b. 1969) |
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| martin claaßen (b. 1963) |
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| christiane claaßen researcher ORCID ID = 0000-0002-8546-2698 |
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| kathrin claaßen German association football player, DE (b. 1989) |
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| andrea claaßen DE (b. 1981) |
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Lea, Achim, Claus, Peter, Georg, Geert, Jörg, Tanja, Edith, Ewald, Helga, Heinz, Horst, Frank, Franz, Markus, Monika, Mirjam, Sandra, Sascha, Alfred, Andrea, Andre, Simon, Silke, Sandy, Tim, Uwe, Marc, Maik, Anne, Arno, Arne, Kurt, Ralf, Dirk, Angela, Jens, Elke, Eric, Harm, Hans, Inga, Ingo, Maria, Marie, Marco, Maike, Nina, and Annett