Family name อุทาร (Uthan 
, Utan 
, อุทาร ) , throughout the world, is quite a rare cognomen. The surname อุทาร is habitual in Turkey, where it is quite a rare surname, Indonesia, where it is a rare surname, and Romania. In absolute terms, it is commonest in Indonesia, Turkey, and India. Also, อุทาร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Uthan | Myanmar, Turkey, Thailand, India, Indonesia |
| Utan | Japan, Turkey, Thailand, India, Indonesia |
| อุทาร | Thailand |