Across the world, Isaias Sebastian (Isaias Sebastian 
) is a very rare male first name. The forename Isaias Sebastian is characteristic of Latin America and the Caribbean, particularly Chile, where it is a very rare male name. Very seldom, Isaias Sebastian is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Isaias Sebastian | Costa Rica, Spain, Chile, Ecuador, Peru |
Ramirez, and Macias Vera