Cognomen Janpangngern (Janpangngern 
) , worldwide, is a very rare family name. The cognomen Janpangngern is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Janpangngern | Thailand |
Sermwit, Anusara, Wararut, and Butsabongkot