Cognomen Cornelsen (Cornelsen 
) , worldwide, is quite a rare surname. The last name Cornelsen is habitual in Germany, where it is a rare surname, Denmark, and Canada. In absolute terms, it most frequently occurs in Germany, Brazil, and the United States.
| VARIANT | COUNTRY |
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| Cornelsen | Brazil, Canada, United States, Germany, Denmark |
| johann theodor cornelsen German politician (1831-1892), DE (b. 1831) |
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| abraham cornelsen (b. 1845) |
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hildegard cornelsen German author (1905-1981), DE (b. 1905) |
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| maria wiens cornelsen (b. 1846) |
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horst cornelsen german writer, author and publisher, PL (b. 1909) |
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| franz cornelsen German jurist (1868-1951), DE (b. 1868) |
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dirk cornelsen German journalist, DE (b. 1940) |
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| franz cornelsen German publisher, DE (b. 1908) |
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| aryon cornelsen association football player (1921-2010) (b. 1921) |
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| ayrton lolô cornelsen Brazilian architect, BR (b. 1922) |
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| ruth cornelsen German publisher, DE (b. 1928) |
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jack cornelsen rugby union player (1994-), AU (b. 1994) |
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| greg cornelsen Australian rugby union player, AU (b. 1952) |
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| claudia cornelsen German writer, DE (b. 1966) |
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| laura cornelsen researcher, ORCID id # 0000-0003-3769-8740 |
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