Cognomen Griniuk (Griniuk 
) , around the world, is a very rare surname. The cognomen Griniuk is characteristic of Lithuania, where it is a rare surname, Georgia, where it is a very rare surname, and Russia, where it is an extremely rare surname. Much less frequently, Griniuk is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Griniuk | France, Lithuania, Poland, United Kingdom, Russia |