Cognomen Йефферсон (Йефферсон 
) , in the entire world, is an extremely rare family name. The surname Йефферсон is characteristic of Eastern Europe, particularly Russia, where it is an extremely rare surname. Also, Йефферсон is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Йефферсон | Russia |
Iefferson, Jefferson, Jjefferson, and Yefferson