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 | Italy, Bulgaria, United States, Romania, Moldova |
| Trajan | Spain, United States, Romania, France, North Macedonia |
| Траян | Kazakhstan, Ukraine, Belarus, Bulgaria, Russia |
| Trayan | Greece, Spain, Bulgaria, United States, Romania |
|
надзея віктараўна траян Hero of the Soviet Union, BY (b. 1921) |
|