Family name Otgonbayar (Otgonbayar 
) , throughout the world, is quite a rare last name. The surname Otgonbayar is habitual in Mongolia, where it is a common surname, Isle of Man, where it is quite a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, the name is most common in Mongolia, the United States, and China. Likewise, Otgonbayar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Otgonbayar | Mongolia, Malaysia, Australia, United States, China |
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luvsanlkhündegiin otgonbayar Mongolian marathon runner, MN (b. 1982) |
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| ravsalyn otgonbayar Mongolian boxer (b. 1955) |
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| sainbuyangiin otgonbayar politician (b. 1962) |
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| ishdorj otgonbayar Mongolian football manager, MN (b. 1968) |
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| merilyn otgonbayar Mongolian figure skater, US |
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