Surname Prostak (Prostak 
) , in the entire world, is a rare cognomen. The cognomen Prostak is habitual in Poland, where it is quite a rare surname, Israel, where it is a rare surname, and France, where it is a very rare surname. In absolute terms, this name is the most popular in Poland, the United States, and France. Also, Prostak is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Prostak | Poland, Israel, France, United States, Germany |
| khaim prostak Victim of the Holocaust, UA (b. 1867) |
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| cilly prostak holocaust victim, b. 1876-10-07, DE (b. 1876) |
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| yisrael prostak Victim of the Holocaust, UA (b. 1902) |
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| feiga prostak Victim of the Holocaust, UA (b. 1910) |
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| irina prostak Belarusian Righteous Among the Nations, BY (b. 1930) |
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| zbigniew prostak PL (b. 1930) |
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| ryszard prostak Polish basketball player, PL (b. 1957) |
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| rafał prostak (b. 1973) |
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| margit prostak |
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