Around the globe, Octavio Guillermo (Octavio Guillermo 
) is a very rare male given name. The given name Octavio Guillermo is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare masculine name, and Peru, where it is a very rare masculine name. Very seldom, Octavio Guillermo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Octavio Guillermo | Peru, Spain, Chile, Mexico, Ecuador |