Family name Oyunbat (Oyunbat 
) , across the world, is a rare last name. The cognomen Oyunbat is habitual in Mongolia, where it is quite a common surname, France, where it is an extremely rare surname, and China. Also, Oyunbat is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oyunbat | China, Hungary, United States, France, Mongolia |