Last name Kuljaj (Kuljaj 
) , in all the world, is a rare cognomen. The cognomen Kuljaj is characteristic of Serbia, where it is quite a rare surname, Croatia, where it is a very rare surname, and Argentina, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kuljaj | Serbia, Croatia, Argentina |
| jasna kuljaj SI (b. 1981) |
|