The name is Gaelic , and its original Irish Language version is or '''Ó Briain''', meaning 'descendant of Brian'. The Brian referred to is in most cases the ancient Irish king Brian Boru . This O'Brien family ruled over Munster after Brian Boru's death, and later supplied the rulers of Thomond until the area became incorporated into the English holdings in Ireland in the Tudor Period (but see the De Clare family). The O'Brien rulers were then given the titles of Earl Of Thomond and Baron Inchiquin , the latter of which survives today and is held by the descendants of the ancient rulers.
- Cardinal O'Brien, Keith Patrick , current Roman Catholic Cardinal Archbishop Of Saint Andrews And Edinburgh .
- O'Brien , member of the Inner Party in the novel Nineteen Eighty-Four by George Orwell
- O'Brien, Conan , (born 1963), US comedian and talk show host.
- O'Brien, Dave, television announcer of the New York Mets
- O'Brien, Edna , Novelist , member of Aosdána
- O'Brien, Flann , '' At Swim-Two-Birds ''
- O'Brien, James , see separate disambiguation page James O'Brien
- '' and ''Deep Space Nine''
- O'Brien, Kerry , Australian ABC Television Current Affairs Presenter
- O'Brien, Larry , political and Basketball figure
- O'Brien, Lora , Irish Author - " Irish Witchcraft From An Irish Witch "
- O'Brien, Miles , CNN anchor
- O'Brien, Miles , '' Star Trek '' character
- O'Brien, Patrick , economic historian
- O'Brien, Richard , (born 1942), Rocky Horror Show and Rocky Horror Picture Show writer and actor
- O'Brien, Robert C. , '' Mrs. Frisby And The Rats Of NIMH ''
- O'Brien, Shauna American erotic film star.
- O'Brien, Stephen UK conservative politician for Eddisbury
- O'Brien, Tim , (born 1946), American author
- O'Brien, Tim , American musician
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