Worldwide, Gustavo Amadeo (Gustavo Amadeo 
) is a very rare male given name. The forename Gustavo Amadeo is habitual in Latin America and the Caribbean, particularly Peru, where it is a very rare male name. Very seldom, Gustavo Amadeo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Gustavo Amadeo | Spain, Chile, Ecuador, Argentina, Peru |