Surname Gaston-Defer (Gaston-Defer 
) , all around the world, is an extremely rare last name. Much more prevalently, Gaston-Defer is the forename as well as the last name. Parts of the name also exists independently as a first name Gaston, and a last name Defer.
| VARIANT | COUNTRY |
|---|---|
| Gaston-Defer | Democratic Republic of the Congo |