Cognomen Černjak (Черняк 
, Černjak 
) , all around the world, is a common surname. The cognomen Černjak is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Ukraine, and Russia, where it is quite a rare surname.
| lion semenovič černjak (b. 1939) |
|
|
| ėduard isaakovič černjak RU (b. 1941) |
|