Cognomen คำสิงห์ (Khamsing 
, Kamsing 
, Khamsingh ) , throughout the world, is quite a rare last name. The family name คำสิงห์ is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Thailand, and Singapore, where it is a rare surname. More frequently, คำสิงห์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khamsing | Laos, Singapore, United States, Thailand, India |
| Kamsing | Hong Kong, United States, Thailand, India, France |
| Khamsingh | India, Thailand |
Kamsaing, Kamsingh, Kamsingha, Khammasing, Khamsingha, Khumsing, and Sing Sing
|
สมรักษ์ คำสิงห์ boxer, TH (b. 1973) |
|
| สมรถ คำสิงห์ Thai boxer, TH (b. 1971) |
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