Surname Sebastian Gustavo (Sebastian Gustavo 
) , all over the world, is a very rare family name. The cognomen Sebastian Gustavo is habitual in Chile, where it is a rare surname, and Spain, where it is a very rare surname. More prevalently, Sebastian Gustavo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sebastian Gustavo | Peru, Argentina, Spain, Chile, Ecuador |