Worldwide, Guillermo Narciso (Guillermo Narciso 
) is a very rare masculine forename. The forename Guillermo Narciso is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare boy's name. Much less frequently, Guillermo Narciso is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guillermo Narciso | Ecuador, Chile, Peru |