Cognomen กาจา (Qaja 
, กาจา 
) , in the world, is a rare last name. The cognomen กาจา is characteristic of Albania, where it is quite a rare surname, Libya, where it is a rare surname, and Switzerland. In absolute terms, this name is the most popular in Albania, Libya, and Thailand. Much less frequently, กาจา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Qaja | Switzerland, United States, Libya, India, Albania |
| กาจา | Thailand |