Cognomen Janplaeng (Janplaeng 
) , in all the world, is a very rare last name. The surname Janplaeng is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Janplaeng is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janplaeng | Thailand |
Preecha, and Phongsakorn