Cognomen Ketelaar (Ketelaar 
) , all over the world, is quite a rare last name. The surname Ketelaar is characteristic of Netherlands, where it is quite a rare surname, Guatemala, where it is a rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in Netherlands, the United States, and Guatemala.
| VARIANT | COUNTRY |
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| Ketelaar | Germany, Guatemala, Australia, Netherlands, United States |
| johan josua ketelaar (b. 1659) |
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theodore matthieu ketelaar Dutch politician (1864-1936), NL (b. 1864) |
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jan ketelaar Dutch chemist (1908-2001), NL (b. 1908) |
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annie ketelaar NL (b. 1909) |
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| dolf ketelaar Dutch politician (1896-1944), NL (b. 1896) |
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| harm ketelaar NL (b. 1894) |
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| sytske ketelaar NL (b. 1911) |
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| eric ketelaar Dutch archivist, NL (b. 1944) |
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| kee ketelaar Dutch actress, NL (b. 1950) |
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| frank ketelaar Dutch film director and screenwriter, NL (b. 1960) |
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| digna ketelaar Dutch tennis player, NL (b. 1967) |
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| james e. ketelaar (b. 1957) |
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| paul ketelaar NL (b. 1960) |
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| marjolijn ketelaar researcher |
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| maria ketelaar researcher |
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