Family name Italo Guillermo (Italo Guillermo 
) , throughout the world, is a very rare last name. The family name Italo Guillermo is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Italo Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Italo Guillermo | Peru, Ecuador, Chile, Sweden |