Surname Loonstra (Loonstra 
) , around the globe, is a rare last name. The cognomen Loonstra is habitual in Netherlands, where it is quite a rare surname, Australia, where it is a very rare surname, and Canada. In absolute terms, it most frequently occurs in Netherlands, Germany, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Loonstra | Germany, Australia, United States, Canada, Netherlands |
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frans loonstra university teacher, NL (b. 1910) |
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dani loonstra figure skater |
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| marten loonstra (b. 1945) |
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| bert loonstra DE (b. 1956) |
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| henk loonstra Dutch association football player, NL (b. 1968) |
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| arna loonstra (b. 1959) |
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| a h jelle loonstra researcher |
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| floor c loonstra researcher (ORCID 0000-0002-1644-4410) |
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