Surname Posayaanuwat (Posayaanuwat 
) , around the world, is a very rare family name. The cognomen Posayaanuwat is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Posayaanuwat | Thailand |
Seksit, Siwanath, Kamonwan, Patrnarint, and Chingchai