Surname Оджак (Odjak 
, Ocak 
, Оджак 
) , around the world, is a common family name. The cognomen Оджак is habitual in Turkey, where it is quite a common surname, Serbia, where it is quite a rare surname, and Belgium. Not in comparison with a country's population, this name is the most popular in Turkey, Germany, and Belgium.
| VARIANT | COUNTRY |
|---|---|
| Odjak | Indonesia |
| Ocak | Serbia, Belgium, Turkey, Indonesia, Germany |
| Оджак | Russia, Bulgaria, Ukraine |
| Odzhak | Kazakhstan |