Cognomen Kleijnen (Kleijnen 
) , in all the world, is a rare surname. The last name Kleijnen is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and the United Kingdom, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Kleijnen | Netherlands, Belgium, Canada, United Kingdom, Germany |
| ida kleijnen Dutch chef, NL (b. 1936) |
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| jack p. c. kleijnen economist (Universiteit van Tilburg) (b. 1940) |
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| ellen kleijnen researcher ORCID ID = 0000-0002-7544-8518 |
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| jos kleijnen researcher |
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| jorrit kleijnen Dutch composer, NL |
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| mirella kleijnen researcher (ORCID 0000-0002-7946-6959) |
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| jean-paul kleijnen researcher ORCID ID = 0000-0002-9940-6718 |
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| jos m p kleijnen researcher |
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