Family name Кулак (Kulak 
, Koulak 
, Кулак 
) , in the world, is a common cognomen. The family name Кулак is habitual in Belarus, where it is quite a common surname, Turkey, and Poland, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Turkey, Ukraine, and Poland. Also, Кулак is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kulak | Germany, Canada, United States, Poland, Turkey |
| Koulak | India, United States, Greece, Tunisia |
| Кулак | Kazakhstan, Ukraine, Kyrgyzstan, Belarus, Russia |
| Culac | Germany, Romania |
| кулак микола UA (b. 1897) |
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| кулак, алексей исидорович Soviet spy and diplomat, RU (b. 1922) |
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| кулак, григорий гаврилович UA (b. 1915) |
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| кулак, василий григорьевич Ukrainian wrestler and coach, UA (b. 1947) |
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| анатоль іосіфавіч кулак BY (b. 1954) |
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| кулак артем ярославович Ukrainian military personnel, UA (b. 1985) |
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| арцём фёдаравіч кулак BY (b. 1996) |
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