Cognomen Ietswaart (Ietswaart 
) , around the world, is a very rare surname. The last name Ietswaart is habitual in Netherlands, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Ietswaart | United Kingdom, United States, Netherlands |
| jan david ietswaart (b. 1911) |
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| boudewijn ietswaart Dutch graphic designer, NL (b. 1936) |
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| jaan h. ietswaart botanist, NL (b. 1940) |
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| david ietswaart Dutch art dealer and collector; estate sale 1749 |
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| magdalena ietswaart researcher |
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