Cognomen สมถะ (Smta 
, Samathan 
, Samatham 
) , in the world, is a rare last name. The family name สมถะ is habitual in India, where it is a very rare surname, Malaysia, and Thailand. Likewise, สมถะ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Smta | India, France, United States |
| Samathan | United Kingdom, Malaysia, United States, India, France |
| Samatham | India, Canada, United States |
| สมถะ | Thailand |
Absomtua, Posumpunsing, Samaattai, Samadt, Samadta, Samadtha, Samahade, Samahteh, Samatarath, Samatdhiya, Samatha, Samathaya, Samathee, Samathini, Samathita, Samatiya, Samatra, Samatsha, Samatsi, Samatta, Samatthapun, Samatthikron, Samatthiyachep, Sammatha, Sanmatha, Sathitsommon, Sittsishobthum, Smatha, Smathimanant, Smatthaphant, Somathasn, Somkht, Sommatt, Somtabakit, Somtach, Somtha, Somthain, Somthaing, Somthan, Somthas, Somthid, Somthimong, Somthiphone, Somthra, Soomtha, and Sumphand