Family name Ubaidullah (Ubaidullah 
) , in the world, is quite a common surname. The family name Ubaidullah is characteristic of Brunei, where it is quite a rare surname, Pakistan, and United Arab Emirates. Not in comparison with a country's population, it is the most numerous in Pakistan, Nigeria, and India. More prevalently, Ubaidullah is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ubaidullah | Saudi Arabia, Nigeria, Afghanistan, India, Pakistan |
Убайдуллах, and Убайдуллохон
| mohd ubaidullah researcher (ORCID 0000-0002-0484-0299) |
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| m. ubaidullah Indonesian political candidate, ID |
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| qazi fazlullah ubaidullah Pakistani politician |
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| mohd asri bin ubaidullah (b. 1971) |
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