Surname Koornneef (Koornneef 
) , all around the world, is a rare last name. The surname Koornneef is characteristic of Netherlands, where it is quite a rare surname, United Arab Emirates, where it is a rare surname, and New Zealand. Measured by absolute frequency, it is commonest in Netherlands, United Arab Emirates, and Canada.
| VARIANT | COUNTRY |
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| Koornneef | United States, United Arab Emirates, Spain, Netherlands, Canada |
| jan koornneef (b. 1868) |
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| leo koornneef university teacher (1945-2001), NL (b. 1945) |
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| maarten koornneef Dutch botanist, NL (b. 1950) |
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| maarten koornneef Dutch rower, NL (b. 1950) |
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| maarten koornneef researcher |
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| floor koornneef researcher |
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| janne koornneef researcher |
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| lieke koornneef researcher |
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| jan koornneef Ph.D. Rijksuniversiteit Groningen 1976 |
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| erik j koornneef researcher (ORCID 0000-0002-3224-6860) |
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| c.j. koornneef |
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