Cognomen Севастиан (Sevastian 
, Севастиан 
, Sevastyan 
) , throughout the world, is quite a rare surname. The surname Севастиан is characteristic of Romania, where it is quite a rare surname, Moldova, and Mexico, where it is a rare surname. Also, Севастиан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sevastian | Romania, Guatemala, Bolivia, Mexico, Colombia |
| Севастиан | Russia |
| Sevastyan | India, Russia, United States |
Bosćij, Seba, Sebastiaan, Sebastiaen, Sebastian, Sebastiano, Sebastianus, Sebastien, Sebastià, Sebastián, Sebastião, Sebastjan, Sebestyén, Sébastien, Себастиан, Себастиано, Себастьен, Себастьян, Себастьяно, סבסטיאן, سباستيان, سيباستيان, セバスチャン, セバスティアン, and 塞巴斯蒂安