Cognomen Harthoorn (Harthoorn 
) , around the globe, is a rare family name. The family name Harthoorn is habitual in Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Harthoorn | Germany, Canada, United States, Netherlands, Belgium |
| samuel eliza harthoorn (b. 1831) |
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| anton harthoorn Dutch swimmer (1866-1937), NL (b. 1866) |
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| willem lodewijk harthoorn NL (b. 1907) |
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frank harthoorn Dutch musician, NL (b. 1968) |
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| willem lodewijk harthoorn NL (b. 1913) |
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| geradine wilhelmine christine harthoorn (b. 1913) |
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| antonie marinus harthoorn veterinarian, ZA (b. 1923) |
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| cornelis jan harthoorn NL |
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| ineke harthoorn NL |
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| p.c. harthoorn |
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