Family name Sebastiâo (Sebastiâo 
) , in all the world, is a rare surname. The cognomen Sebastiâo is characteristic of Angola, where it is a rare surname, and Brazil, where it is an extremely rare surname. Much less frequently, Sebastiâo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sebastiâo | Brazil, Angola |
Sebastiao, and Sebastiaso