Cognomen กุศลธรรม (Charitho 
, กุศลธรรม , Charitham ) , around the world, is a very rare family name. The last name กุศลธรรม is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, กุศลธรรม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Charitho | Mexico, Colombia, Peru, Thailand |
| กุศลธรรม, Kusontham, Charitham | Thailand |
Charittha, Charittham, Charity, Charvalit, Karmakharm, and Kusolthammarat