Family name Kooyker (Kooyker 
) , worldwide, is a very rare last name. The last name Kooyker is habitual in Netherlands, where it is a rare surname, Germany, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Kooyker | Brazil, Netherlands, United States, Germany |
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hendrik albert kooyker university teacher from the Netherlands (1832-1904), NL (b. 1832) |
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| albert kooyker NL (b. 1947) |
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| arthur i kooyker researcher (ORCID 0000-0001-6324-0931) |
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| hendrik albert kooyker M.D. Universiteit Leiden 1861 |
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