Cognomen Ploysuay (Ploysuay 
) , across the world, is an extremely rare family name. Much more prevalently, Ploysuay is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ploysuay | Thailand |
Sootsuwan, Kingsunklang, Phanngam, Graisoon, Sayadpanich, Jitpakdee, and Taweesook