Cognomen Gradelle (Gradelle 
) , throughout the world, is a rare surname. The surname Gradelle is habitual in France, where it is a rare surname, and the United States, where it is an extremely rare surname. Also, Gradelle is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gradelle | Philippines, Spain, France, United States, Democratic Republic of the Congo |