Cognomen ฐา (Tha 
, ฐา 
) , in the world, is a common family name. The last name ฐา is characteristic of Myanmar, where it is quite a common surname, Romania, and Malaysia, where it is quite a rare surname. Not in comparison with a country's population, this name is the most popular in Myanmar, India, and Indonesia. Likewise, ฐา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tha | Myanmar, Malaysia, India, Romania, Indonesia |
| ฐา | Thailand |