Family name Wassenaar (Wassenaar 
) , all over the world, is quite a rare cognomen. The last name Wassenaar is habitual in Netherlands, where it is quite a common surname, Estonia, where it is quite a rare surname, and South Africa, where it is a rare surname. In absolute terms, it is commonest in Netherlands, the United States, and South Africa.
| VARIANT | COUNTRY |
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| Wassenaar | Germany, South Africa, United States, Canada, Netherlands |
| jan ii fan wassenaar NL (b. 1483) |
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| teunis fan wassenaar NL (b. 1520) |
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| henrica van duivenvoorde en wassenaar (b. 1595) |
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| jacob unico wilhelm graaf van wassenaer obdam heer van wassenaar, lage, twickel, obdam, spierdijk, wogmeer, hensbroek, zuidwijk, kernheim, weldam en olidam (1769-1812) (b. 1769) |
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| k.a. wassenaar (b. 1764) |
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| gerrit willems wassenaar (b. 1781) |
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| bente wassenaar NL (b. 1796) |
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| josua nicolzon wassenaar politician, NL (b. 1848) |
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| willem abraham wassenaar NL (b. 1873) |
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bram wassenaar Dutch sportsperson and athletics competitor, NL (b. 1944) |
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| theo wassenaar ZA (b. 1892) |
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bert wassenaar Dutch equestrian, NL (b. 1957) |
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| steven wassenaar Dutch photographer, NL (b. 1965) |
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| eelco wassenaar Olympic field hockey player, US (b. 1973) |
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| willem wassenaar theatre director in New Zealand, NL (b. 1979) |
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