Cognomen Phayakkayat (Phayakkayat 
) , around the globe, is a very rare family name. The cognomen Phayakkayat is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phayakkayat | Thailand |
Pawalawan, Uraiwan, Khwanchanok, and Wannaprapha