Family name Gagny (Gagny 
) , around the globe, is a very rare cognomen. The last name Gagny is characteristic of France, where it is a very rare surname, and the United States, where it is an extremely rare surname. More frequently, Gagny is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Gagny | Mali, United States, Spain, France |