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Worldwide, William Sebastian (William Sebastian
) is a very rare male first name. The forename William Sebastian is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare male name, and Peru, where it is a very rare boy's name. Very seldom, William Sebastian is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| William Sebastian | Spain, Colombia, Ecuador, Chile, Peru |
Berg, Araya, Reyes, Cortes, Quispe, Rodriguez, Rojas Madariaga, Santisteban, Torres Anton, Fajardo LondoƱo, Morales Morales, and Sepulveda Lobos