Cognomen Grelly (Grelly 
) , all around the world, is a very rare last name. The surname Grelly is habitual in Switzerland, where it is a rare surname, Venezuela, where it is a very rare surname, and France. Also, Grelly is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grelly | Philippines, Switzerland, France, Peru, Venezuela |