Family name ถา (Tha 
, ถา 
) , around the globe, is a common last name. The last name ถา is habitual in Myanmar, where it is quite a common surname, Romania, and Malaysia, where it is quite a rare surname. In absolute terms, it most frequently occurs in Myanmar, India, and Indonesia. Likewise, ถา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Tha | Malaysia, Indonesia, India, Myanmar, Romania |
| ถา | Thailand |