Around the globe, Guillerm (Guillerm 
) is a rare predominantly boy's, but very seldom feminine given name. The forename Guillerm is characteristic of the United States, where it is a very rare male name, Argentina, and France, where it is a very rare epicene name. Much more prevalently, Guillerm is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guillerm | Canada, France, Spain, Belarus, United States |