Cognomen Willemen (Willemen 
) , in all the world, is quite a rare family name. The last name Willemen is habitual in Belgium, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Brazil, where it is a rare surname. Very seldom, Willemen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Willemen | Belgium, Netherlands, Brazil, France, Germany |
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ad willemen Dutch visual artist (1941-2013), NL (b. 1941) |
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kees willemen NL (b. 1943) |
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| jan willemen Dutch graphic artist (1912-1985), NL (b. 1912) |
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| paul willemen born:1944-08-14|died:2012-05-13|; Willemen, Paul, 1944-2012 (b. 1944) |
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| charles willemen BE (b. 1941) |
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daan willemen diver, NL |
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| karel willemen Dutch designer, NL (b. 1967) |
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| tim willemen researcher (ORCID 0000-0001-7655-3726) |
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| agnes m willemen researcher (ORCID 0000-0002-0912-2608) |
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| wieteke louise willemen researcher |
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| willean bernardo willemen football player (b. 1997) |
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