Cognomen Leon Guillermo (Leon Guillermo 
) , across the world, is a very rare family name. The surname Leon Guillermo is habitual in Ecuador, where it is a rare surname, Chile, where it is a very rare surname, and Spain, where it is an extremely rare surname. Also, Leon Guillermo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leon Guillermo | Mexico, Chile, Ecuador, Colombia, Costa Rica |