Family name กุลธารา (Kunthara 
, กุลธารา ) , worldwide, is a rare surname. The surname กุลธารา is characteristic of Indonesia, where it is a very rare surname, Thailand, where it is an extremely rare surname, and the United States. Measured by absolute frequency, it is commonest in Indonesia, the United States, and India. Likewise, กุลธารา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kunthara | India, Thailand, United States, Indonesia |
| กุลธารา | Thailand |