Cognomen كاجا (Kaja 
, كاجا 
) , in the entire world, is a common surname. The cognomen كاجا is characteristic of Albania, where it is quite a common surname, Slovenia, and Kosovo, where it is quite a rare surname. In absolute terms, it most frequently occurs in India, Malaysia, and Albania. Likewise, كاجا is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kaja | Albania, Poland, India, Slovenia, Malaysia |
| كاجا | Sudan |