Cognomen Себастиа (Sebastiá 
, Себастиа 
) , in the world, is a very rare family name. The surname Себастиа is habitual in Spain, where it is a rare surname, Argentina, where it is an extremely rare surname, and Mexico. Much less frequently, Себастиа is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sebastiá | Mexico, Argentina, Spain |
| Себастиа | Armenia |