Family name Jangjun (Jangjun 
) , worldwide, is a very rare last name. The surname Jangjun is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Jangjun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jangjun | United States, Thailand |
Jitti, Dharinorn, Lamyuang, Suthinisa, Chanasit, Chawadon, Panupong, Pongchai, Jongjaroen, Monnaphachanok, and Chanutpapha