Surname Umnaj (Umnaj 
) , all over the world, is an extremely rare family name. Predominantly, Umnaj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Umnaj | United States, India, Thailand |
Saelee, Saeheng, Srisarn, Detphala, Jaimook, Boonseirmsup, Korpongcharoenchai, Ruangrot, Vannavat, Wutiwongkam, Likitpunpisit, Luangchouychok, Thareererg, Dumrongkulraksa, and Suttiwongsakul