Family name Inpheng (Inpheng 
) , all around the world, is a rare cognomen. The surname Inpheng is habitual in Laos, where it is quite a rare surname, Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Inpheng | France, Laos, United States, Thailand |