Family name Gilja (길자 
, Gilja 
, Гиля 
) , across the world, is a rare surname. The surname Gilja is characteristic of Bosnia and Herzegovina, where it is quite a rare surname, Croatia, and Norway, where it is a rare surname. More prevalently, Gilja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 길자 | South Korea |
| Gilja | Bosnia and Herzegovina, Norway, South Korea, India, Croatia |
| Гиля | Kazakhstan, Kyrgyzstan, Russia, Ukraine |
| odd helge gilja researcher (b. 1962) |
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| vikash gilja researcher (ORCID 0000-0002-0619-2686) |
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| ante gilja |
|