Last name Koekoek (Koekoek 
) , globally, is quite a rare cognomen. The cognomen Koekoek is habitual in Western Europe, particularly Netherlands, where it is quite a rare surname, Belgium, where it is a rare surname, and Austria.
| VARIANT | COUNTRY |
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| Koekoek | Netherlands, Belgium, Canada, Austria, Denmark |
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hendrik koekoek Dutch politician (1912-1987), NL (b. 1912) |
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| jacobus koekoek Dutch Righteous Among the Nations, NL (b. 1888) |
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| roelfje koekoek NL (b. 1888) |
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| henriette koekoek holocaust victim, b. 1908-04-16 (b. 1908) |
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| barend koekoek holocaust victim, b. 1911-07-13 (b. 1911) |
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| henri koekoek holocaust victim, b. 1939-04-11 (b. 1939) |
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| roelof koekoek (b. 1963) |
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| roelof koekoek Ph.D. Technische Universiteit Delft 1990 |
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| gerda koekoek makeup artist |
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| tom koekoek Dutch association football referee, NL (b. 1988) |
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| rick koekoek NL (b. 1986) |
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