Cognomen คำฝ้าย (Kamfai 
, คำฝ้าย) , all around the world, is a very rare surname. The surname คำฝ้าย is characteristic of Eastern Asia, particularly Hong Kong, where it is a rare surname, and China, where it is an extremely rare surname. More prevalently, คำฝ้าย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kamfai | Hong Kong, Thailand, Macao, United States, China |