Cognomen Suwanphayak (Suwanphayak 
) , in all the world, is a very rare family name. The family name Suwanphayak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Suwanphayak | Thailand |
Buamas, Orrawan, and Thaweeporn