Family name Derfy (Derfy 
) , in the world, is an extremely rare surname. The last name Derfy is habitual in Colombia, where it is a very rare surname, Venezuela, where it is an extremely rare surname, and the United States. Predominantly, Derfy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Derfy | Venezuela, United States, Colombia, Democratic Republic of the Congo, India |