Surname Траян (Traian 
, Trajan 
, Траян 
) , in the entire world, is quite a common cognomen. The last name Траян is characteristic of North Macedonia, where it is quite a common surname, Romania, and Bulgaria, where it is quite a rare surname. Likewise, Траян is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Traian | Moldova, Bulgaria, Romania, United States, Italy |
| Trajan | Spain, France, Romania, United States, North Macedonia |
| Траян | Kazakhstan, Belarus, Bulgaria, Russia, Ukraine |
| Trayan | Spain, Bulgaria, Greece, Romania, United States |
|
надзея віктараўна траян Hero of the Soviet Union, BY (b. 1921) |
|