Surname Briain (ブライアン 
, Briain 
, ブリアン) , throughout the world, is a rare last name. The surname Briain is habitual in Ireland, where it is quite a rare surname, Japan, where it is a rare surname, and France, where it is a very rare surname. Likewise, Briain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| ブライアン | Japan |
| Briain | United Kingdom, United States, Ireland, India, France |
| domhnall mac briain (b. 901) |
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muircheartach ua briain High King of Ireland, IE (b. 1050) |
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domnall mac taidc uí briain, domnall ua briain, domhnall ua briain, domhnall mac taidhg King of the Isles; King of Thomond (b. 1050) |
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| toirdelbach ua briain high King of Ireland (b. 1009) |
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| diarmait ua briain King of Munster, IE (b. 1060) |
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| donnchad mac briain ó briain (b. 1250) |
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| donnchad o briain Ó Briain, Donnchad [Donogh O'Brien] (1425–1460), bishop of Killaloe (b. 1425) |
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| seán ó briain Irish storyteller, IE (b. 1852) |
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| féilim ó briain IE (b. 1895) |
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| conchúr crús ó briain Irish politician, writer, historian and academic (1917-2008), IE (b. 1917) |
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donnchad mac briain Irish king, IE |
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conor na siudane ua briain King of Thomond, IE |
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| tadhg an chomhaid ó briain King of Thomond from 1459 to his death in 1466 |
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| toirdelbach mac murchada meic briain Irish army leader |
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| muircheartach mac murchadha ó briain Irish clergyman |
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