Last name Chernjak (Черняк 
, Chernjak 
) , in the world, is a common cognomen. The last name Chernjak is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, and Russia, where it is quite a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Черняк | Kazakhstan, Ukraine, Belarus, Kyrgyzstan, Russia |
| Chernjak | Germany, Belarus |
| natalja gennadevna chernjak RU (b. 1962) |
|
|
| dmitrij mikhajlovich chernjak RU (b. 1966) |
|