In all the world, คำคูณ (Khamkoon 
, Kamkoon , Khamkhun 
) is an extremely rare unknown gender forename. Likewise, คำคูณ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Khamkoon | Laos, United States, Thailand |
| Kamkoon | Thailand |
| Khamkhun | Singapore, Thailand |