Family name คำสอน (Khammanh 
, Khamson 
, คำสอน) , across the world, is a rare cognomen. The family name คำสอน 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. Measured by absolute frequency, this name is the most popular in Thailand, Laos, and the United States. More prevalently, คำสอน is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khammanh | Canada, Laos, United States, Thailand, France |
| Khamson | United Kingdom, United States, Malaysia, Thailand, India |
Kamson, Khammanang, Khamnark, Khamngeon, and Khamsanor