Cognomen Delja (Delja 
) , around the globe, is a rare surname. The surname Delja is characteristic of Southern Europe, particularly Montenegro, where it is quite a rare surname, Bosnia and Herzegovina, and Serbia, where it is a rare surname. Much less frequently, Delja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Delja | Bosnia and Herzegovina, Montenegro, Serbia, India, United States |