Last name ตถา (Tatha 
, ตถา ) , in the entire world, is a rare family name. The surname ตถา is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Indonesia, and Malaysia, where it is a very rare surname. In absolute terms, it is commonest in India, Indonesia, and Thailand. Likewise, ตถา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tatha | Indonesia, Colombia, Thailand, United States, India |
| ตถา | Thailand |