Last name Ó Briain (Ó Briain 
) , all over the world, is a very rare surname. The last name Ó Briain is characteristic of Northern Europe, particularly Ireland, where it is a rare surname.
| liam ó briain Irish language expert and political activist (b. 1888) |
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| donnchadh ó briain Irish politician, IE (b. 1897) |
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dara ó briain Irish comedian and television presenter, IE (b. 1972) |
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| muircheartach mac toirdhelbaich ó briain king of Thomond |
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