Family name Atthasith (Atthasith 
) , around the world, is an extremely rare last name. The cognomen Atthasith is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Atthasith is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Atthasith | Thailand |
Sakulkoo, Hirunwong, Chamnanua, Thanomjit, Nuchprapha, and Issaraphanphong