Family name Guillermo Paul (Guillermo Paul 
) , throughout the world, is an extremely rare surname. The cognomen Guillermo Paul is habitual in Latin America and the Caribbean, particularly Chile, where it is an extremely rare surname. Much more frequently, Guillermo Paul is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Guillermo Paul | Mexico, Peru, Ecuador, Spain, Chile |