Cognomen Kamsamarn (Kamsamarn 
) , worldwide, is an extremely rare last name. The surname Kamsamarn is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kamsamarn | Thailand |
Smitthi, Thanaree, Thanachai, Hataiphat, and Chompunuch