In the entire world, Guillermo Blas (Guillermo Blas 
) is a very rare masculine forename. The forename Guillermo Blas is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare male name. Much less frequently, Guillermo Blas is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guillermo Blas | Argentina, Spain, Ecuador, Chile, Peru |