Last name O'Brien (O'Brien 
, オブライエン 
, О'Брайен 
) , in all the world, is a common family name. The surname O'Brien is habitual in Ireland, where it is a common surname, Australia, where it is quite a common surname, and Jersey (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in the United States, Australia, and Ireland. Much less frequently, O'Brien is the forename as well as the last name.
| donough cairbreach o'brien King of Thomond (b. 1180) |
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murrough o'brien, 1st earl of thomond Irish earl (b. 1450) |
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| donogh o'brien, 4th earl of thomond Irish nobleman and soldier (b. 1501) |
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| connor o'brien, 3rd earl of thomond Irish earl (b. 1535) |
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henry o'brien, 5th earl of thomond Irish earl (b. 1588) |
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barnabas o'brien, 6th earl of thomond Irish politician (b. 1590) |
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| murrough mcdermot o'brien, 3rd baron inchiquin Irish Baron (b. 1550) |
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| dermod o'brien, 2nd baron inchiquin Irish baron (b. 1550) |
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| murrough o'brien, 4th baron inchiquin Irish Baron (b. 1562) |
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murrough o'brien, 1st earl of inchiquin Irish soldier (b. 1614) |
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henry o'brien, 7th earl of thomond Irish earl (b. 1620) |
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| torlogh o'brien (1571-1584) (b. 1571) |
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| honora o'brien Peerage person ID=31876 (b. 1571) |
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| slany o'brien Peerage person ID=38446 (b. 1575) |
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| daniel o'brien, 1st viscount clare Irish politician (b. 1577) |
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