Last name Giantoni (Giantoni 
) , across the world, is a very rare family name. The family name Giantoni is habitual in Indonesia, where it is a very rare surname, Venezuela, where it is an extremely rare surname, and the United States. Very seldom, Giantoni is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Giantoni | Brazil, Italy, United States, Indonesia, Venezuela |