Surname อินทร (Indara 
, อินทร , Inthorn 
) , in all the world, is quite a rare family name. The surname อินทร is characteristic of Thailand, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it most frequently occurs in Thailand, the Democratic Republic of the Congo, and Indonesia. More frequently, อินทร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Indara | Thailand, Indonesia, India, Democratic Republic of the Congo, Brazil |
| อินทร | Thailand |
| Inthorn | Germany, Malaysia, Thailand, Netherlands, United States |
| Inthon | Malaysia, Thailand, Canada, United States, Myanmar |