Family name Humberto Guillermo (Humberto Guillermo 
) , in the world, is a very rare last name. The surname Humberto Guillermo is characteristic of Latin America and the Caribbean, particularly Chile, where it is a rare surname. More frequently, Humberto Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Humberto Guillermo | Argentina, Chile, Peru, Mexico, Ecuador |