Surname Onderwater (Onderwater 
) , in all the world, is quite a rare cognomen. The surname Onderwater is characteristic of Aland Islands, where it is quite a common surname, Netherlands, where it is quite a rare surname, and Belgium, where it is a rare surname. Not in comparison with a country's population, it is commonest in Netherlands, Canada, and Belgium.
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| Onderwater | Netherlands, Canada, Belgium, United States, Australia |
| pompejus onderwater (1713-1783) (b. 1713) |
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dirk onderwater NL (b. 1768) |
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| h. onderwater (b. 1747) |
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hendrik theodorus de court onderwater Dutch painter, NL (b. 1877) |
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| mattheus onderwater civil servant, NL (b. 1874) |
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| marisa onderwater NL (b. 1911) |
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| harry onderwater Dutch police officer (1950-2012), NL (b. 1950) |
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| cornelis johannes gerardus onderwater Ph.D. Vrije Universiteit Amsterdam 1998 |
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| lyneke onderwater botanical collector in New Zealand |
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| g onderwater particle physicist at University of Groningen, Netherlands |
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| gerrit l j onderwater researcher |
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| martijn onderwater Ph.D. Vrije Universiteit Amsterdam 2016 |
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| aagje jans onderwater - 12 Oct 1625 |
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| hans onderwater |
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