Family name Claesen (Claesen 
, Класен 
) , in the entire world, is quite a rare cognomen. The cognomen Claesen is characteristic of Belgium, where it is quite a common surname, Denmark, where it is quite a rare surname, and Netherlands, where it is a rare surname. Very seldom, Claesen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Claesen | Denmark, Germany, France, Netherlands, Belgium |
| Класен | Kazakhstan, Russia, Ukraine, Kyrgyzstan |
| ch. claesen BE (b. 1829) |
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| edgard lyon - claesen BE (b. 1857) |
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| jef claesen BE (b. 1878) |
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| hans claesen Dutch sculptor, NL (b. 1925) |
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| léon-bernard claesen French politician, FR (b. 1954) |
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| ludo claesen Belgian conductor, composer and musicologist, BE (b. 1956) |
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| nico claesen Belgian footballer, BE (b. 1962) |
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| marcel claesen Belgian singer, BE (b. 1965) |
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| marc claesen Belgian opera singer, BE (b. 1968) |
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| pieter claesen Belgian chess player, BE (b. 1971) |
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| jeroen claesen Belgian chess player (b. 1974) |
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| marc claesen Ph.D. Katholieke Universiteit Leuven 2015 |
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| jan claesen researcher |
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| karen claesen researcher (ORCID 0000-0001-7414-6385) |
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| joep l a claesen researcher (ORCID 0000-0002-6089-1090) |
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