Family name Pewnuan (Pewnuan 
) , all over the world, is a very rare cognomen. The cognomen Pewnuan is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pewnuan | Thailand |
Nikom, Nikome, Chayanit, Pongsatorn, and Phongsathon