Cognomen Koulak (Koulak 
, Кулак 
) , globally, is quite a common last name. The surname Koulak is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, where it is quite a rare surname, and Russia, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koulak | Tunisia, India, Greece, United States |
| Кулак | Russia, Kazakhstan, Ukraine, Kyrgyzstan, Belarus |
|
pierre koulak French actor, FR (b. 1942) |
|
| paul koulak French composer, FR (b. 1943) |
|