Family name Erwin Guillermo (Erwin Guillermo 
) , worldwide, is a very rare surname. The last name Erwin Guillermo is habitual in Latin America and the Caribbean, particularly Chile, where it is a rare surname. More frequently, Erwin Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Erwin Guillermo | Costa Rica, Ecuador, Chile, Peru |