Cognomen Marcelo Amadeo (Marcelo Amadeo 
) , all around the world, is an extremely rare last name. The surname Marcelo Amadeo is habitual in Latin America and the Caribbean, particularly Chile, where it is a very rare surname. More prevalently, Marcelo Amadeo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Marcelo Amadeo | Costa Rica, Chile, Argentina, Ecuador |