Cognomen Гюльджан (Gülcan 
, Gyuldzhan 
, Гюльджан 
) , in all the world, is a common last name. The cognomen Гюльджан is characteristic of Turkey, where it is quite a common surname, Germany, where it is a rare surname, and Bulgaria. More prevalently, Гюльджан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gülcan | Turkey, Germany, China, Austria, Bulgaria |
| Gyuldzhan | Turkey, Spain, United States, Bulgaria, Greece |
| Гюльджан | Kazakhstan, Russia, Ukraine |