Cognomen Cesareo Guillermo (Cesareo Guillermo 
) , all around the world, is an extremely rare family name. The surname Cesareo Guillermo is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. More frequently, Cesareo Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Cesareo Guillermo | Ecuador, Chile, Spain |