Surname Oolak (Оолак 
, Oolak 
) , in the entire world, is a very rare last name. The last name Oolak is characteristic of Eastern Europe, particularly Russia, where it is a very rare surname. Much less frequently, Oolak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Оолак | Russia |
| Oolak | India, Russia |