Cognomen Dungjai (Dungjai 
) , globally, is a rare family name. The cognomen Dungjai is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, and Thailand, where it is a very rare surname. Also, Dungjai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Dungjai | Laos, United States, Thailand |