Worldwide, Güelfo (Guelfo 
, Güelfo ) is a rare male given name. The given name Güelfo is characteristic of Italy, where it is quite a rare male name, Austria, where it is a rare male name, and Germany, where it is a very rare masculine name. Likewise, Güelfo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Guelfo | Spain, Italy, France, United States, Argentina |
| Güelfo | Spain, Argentina |