Cognomen คำผาย (Khamphai 
, คำผาย) , in all the world, is a rare family name. The surname คำผาย is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Thailand, where it is a rare surname, and Malaysia, where it is a very rare surname. In absolute terms, this name is the most popular in Laos, Thailand, and France. More frequently, คำผาย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khamphai | Laos, Malaysia, United States, Thailand, France |