Cognomen Sebastyao (Sebastyao 
, Себастиао 
) , in the entire world, is a very rare surname. The surname Sebastyao is characteristic of Eastern Europe, particularly Russia, where it is an extremely rare surname. Also, Sebastyao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sebastyao | India, Brazil |
| Себастиао | Russia |