Cognomen Proos (Proos 
) , in the entire world, is a rare last name. The last name Proos is habitual in Estonia, where it is quite a common surname, Sweden, where it is quite a rare surname, and Netherlands, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Estonia, the United States, and Sweden. Very seldom, Proos is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Proos | Sweden, Netherlands, United States, Australia, Estonia |
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margus proos Estonian mountaineer and entrepreneur, EE (b. 1962) |
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| artur proos EE (b. 1914) |
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| taimi proos (b. 1915) |
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| ivi proos Estonian economist and sociologist, EE (b. 1948) |
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| john proos American politician, US (b. 1969) |
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| john proos Ph.D. University of Waterloo 2003 |
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| sofie proos SE (b. 1974) |
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| peeter proos EE (b. 1983) |
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