Cognomen บุญจา (Bunja 
, บุญจา 
) , around the globe, is a rare surname. The cognomen บุญจา is characteristic of Croatia, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Thailand, Croatia, and the United States. More prevalently, บุญจา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Bunja | Gambia, India, Croatia, Sudan, United States |
| บุญจา | Thailand |