Family name Gerson Guillermo (Gerson Guillermo 
) , around the globe, is an extremely rare surname. The cognomen Gerson Guillermo is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Predominantly, Gerson Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gerson Guillermo | Costa Rica, Chile, Peru, Ecuador |