Cognomen Ерджан (Erdjan 
, Ерджан 
, Erdzhan 
) , around the globe, is a rare last name. The cognomen Ерджан is characteristic of North Macedonia, where it is quite a common surname, Bulgaria, where it is quite a rare surname, and Ukraine, where it is a very rare surname. Also, Ерджан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Erdjan | Germany, France, Serbia, Bulgaria, North Macedonia |
| Ерджан | Azerbaijan, Russia, Bulgaria, Kazakhstan, Ukraine |
| Erdzhan | Germany, France, North Macedonia, Bulgaria, Romania |