Family name รัทธา (Rattha 
, Ratthata , Raththa ) , all over the world, is a rare cognomen. The last name รัทธา is habitual in Thailand, where it is a rare surname, and India, where it is an extremely rare surname. More prevalently, รัทธา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rattha | Cambodia, Thailand, United States, India, Myanmar |
| รัทธา, Ratthata | Thailand |
| Raththa | India, Thailand |
ปารณีย์, and พิมพ์พิชชา