Cognomen Hornstra (Hornstra 
) , throughout the world, is a rare surname. The cognomen Hornstra is characteristic of Netherlands, where it is quite a rare surname, Australia, where it is a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in Netherlands, the United States, and Australia.
| VARIANT | COUNTRY |
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| Hornstra | Australia, Germany, Netherlands, Canada, United States |
| klaas jeltes hornstra NL (b. 1846) |
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| john j. hornstra American politician, US (b. 1876) |
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| robijn hornstra Dutch university teacher (1898-1973), NL (b. 1898) |
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| lieuwe hornstra Dutch physician, NL (b. 1908) |
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rob hornstra Dutch photographer, NL (b. 1975) |
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| henk hornstra politician, NL (b. 1948) |
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| h.r. hornstra politician (b. 1951) |
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| inge hornstra Australian actress, AU (b. 1974) |
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| heidie hornstra researcher |
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| rianne hornstra researcher (ORCID 0000-0001-8797-8973) |
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| luc m. hornstra |
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| heidie hornstra |
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