Surname Giljen (Giljen 
) , in the world, is a rare cognomen. The family name Giljen is habitual in Montenegro, where it is quite a common surname, Serbia, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, Giljen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Giljen | Serbia, Philippines, United States, South Africa, Montenegro |
|
nikola giljen (b. 1971) |
|
| vladan giljen Montenegrin footballer, ME (b. 1989) |
|