Family name Oyunbaatar (Oyunbaatar 
) , worldwide, is a rare cognomen. The family name Oyunbaatar is characteristic of Mongolia, where it is quite a common surname, the United States, where it is an extremely rare surname, and Brazil. Much less frequently, Oyunbaatar is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oyunbaatar | Brazil, Mongolia, United States |
| tumendemberel oyunbaatar chess player (b. 1979) |
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| otgonbayar oyunbaatar association football player, MN (b. 1993) |
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| oyunbaatar mijiddorj association football player, MN (b. 1996) |
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