Cognomen Gustavo Amadeo (Gustavo Amadeo 
) , worldwide, is an extremely rare surname. The last name Gustavo Amadeo is characteristic of Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Gustavo Amadeo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gustavo Amadeo | Spain, Chile, Ecuador, Argentina, Peru |