Last name Gerardo Joao (Gerardo Joao 
) , throughout the world, is an extremely rare cognomen. The surname Gerardo Joao is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Gerardo Joao is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gerardo Joao | Chile, Peru, Ecuador |