Surname Guillermo Blas (Guillermo Blas 
) , in the entire world, is an extremely rare cognomen. The surname Guillermo Blas is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More frequently, Guillermo Blas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillermo Blas | Argentina, Spain, Ecuador, Chile, Peru |