All around the world, Guglielmetti (Guglielmetti 
) is a rare epicene first name. The first name Guglielmetti is habitual in Southern Europe, particularly Italy, where it is a rare gender-neutral name. Much more frequently, Guglielmetti is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guglielmetti | Argentina, France, United States, Switzerland, Italy |