Cognomen Koornhof (Koornhof 
) , all over the world, is a rare family name. The surname Koornhof is habitual in Netherlands, where it is a rare surname, South Africa, and Canada, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in South Africa, Netherlands, and the United Kingdom. Very seldom, Koornhof is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Koornhof | Netherlands, Canada, South Africa, United Kingdom, United States |
| piet koornhof South African politician, ZA (b. 1925) |
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| nicolaas jacobus janse van rensburg koornhof South African politician |
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| gerhard koornhof South African politician, ZA |
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| gerhardus koornhof South African politician, ZA |
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| hendrik koornhof researcher (ORCID 0000-0002-0742-7731) |
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| carolina koornhof |
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Mr, Philip, Danika, Janine, Jennie, Jeroen, Thomas, Hannes, Herman, Helene, Pieter, Wesley, Mikaeel, Phillip, Douglas, Grazyna, Liesbet, Jacobus, Natasha, Hendrik, Carolina, Melissa, Konrad, Corine, Carmen, Kim, J J, Mara, Bart, Prof, Piet, Rina, Jack, Jake, Hans, Otto, Anton, Karin, Kobie, Renzo, Geran, Grace, Liezl, Johan, Jenny, Hilda, Pierette, and Reinhild