Last name Koomen (Koomen 
) , globally, is quite a rare cognomen. The surname Koomen is habitual in Netherlands, where it is quite a common surname, Australia, where it is a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in Netherlands, the United States, and Australia. Much less frequently, Koomen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koomen | Australia, United Kingdom, United States, Netherlands, Canada |
| frederika wilhelmina koomen Dutch photographer, NL (b. 1877) |
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theo koomen Dutch radio host, television presenter and presenter, NL (b. 1929) |
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myra koomen Dutch politician, NL (b. 1966) |
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| gerrit jan koomen university teacher (1941-2019), NL (b. 1941) |
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| martin koomen NL (b. 1939) |
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| philip koomen furniture designer, GB (b. 1953) |
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| arie koomen Dutch cabaret artist, NL (b. 1968) |
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| arjan de koomen (b. 1962) |
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| jannet koomen Dutch speed skater, NL (b. 1976) |
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| wilfried koomen director and filmmaker |
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| peter koomen Dutch arachnologist |
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| pete koomen Internet entrepreneur, US |
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| bregje koomen researcher (ORCID 0000-0002-3106-5734) |
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| jeroen v koomen researcher |
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| rebecca koomen researcher (ORCID 0000-0002-4198-8874) |
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