Last name Klasen (Klasen 
, Класен 
) , around the world, is quite a common cognomen. The last name Klasen is characteristic of Western Europe, particularly Germany, where it is quite a rare surname, Netherlands, and Luxembourg. In absolute terms, it most frequently occurs in Germany, the United States, and Netherlands.
| VARIANT | COUNTRY |
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| Klasen | Netherlands, Brazil, France, United States, Germany |
| Класен | Kazakhstan, Kyrgyzstan, Russia, Ukraine |
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karl klasen President of the Bundesbank, DE (b. 1909) |
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| franz klasen (b. 1852) |
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peter klasen German sculptor, photographer and painter, DE (b. 1935) |
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| franz klasen (b. 1879) |
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| bertus klasen Dutch designer, NL (b. 1889) |
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| karl christian klasen German painter, DE (b. 1911) |
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robert klasen Swedish musician, SE (b. 1962) |
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| sepp klasen German politician, DE (b. 1935) |
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linus klasen Swedish ice hockey player, SE (b. 1986) |
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jacqueline klasen German association football player, DE (b. 1994) |
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| jürgen klasen (b. 1938) |
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| jörn klasen German physician (b. 1951) |
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| christiane klasen (born 1955) (b. 1955) |
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| odilo klasen German composer, DE (b. 1959) |
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| stephan klasen economist (Georg-August-Universität Göttingen; ifo Institut - Leibniz-Institut für Wirtschaftsforschung an der Universität München e.V.; Institute of Labor Economics (IZA)), DE (b. 1966) |
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