Cognomen Кельжа (Kelja 
, Кельжа 
) , in the world, is a very rare last name. The cognomen Кельжа is characteristic of Finland, where it is a rare surname, and Russia, where it is a very rare surname. Very seldom, Кельжа is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kelja | Finland, Spain, United States |
| Кельжа | Kazakhstan, Russia |