Cognomen เกษมสุข (เกษมสุข 
, Kasemsuk 
, Kasemsook 
) , around the world, is quite a common last name. The family name เกษมสุข is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, เกษมสุข is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kasamsook, เกษมสุข | Thailand |
| Kasemsuk | Thailand, Spain, Malaysia, Canada, United States |
| Kasemsook | Thailand, Turkey, Malaysia, United States, Norway |