Surname Maps for the O'Brien Surname in Ireland
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Census Surname Maps for the O'Brien Surname
Note that it is likely that some Ulster-Scots speakers reported that they only spoke Irish. Both censuses contained a question concerned with whether a person spoke Irish, English or both. No other languages were mentioned.
Surname Counts and Rankings
There were 5,859 with the surname O'Brien in Ireland in 1901 and 4,431 in 1911.
This ranks the surname 108th in 1901 and 165th in 1911.
Surname Count in Connacht in 1901: 562
Surname Ranking in Connacht in 1901: 224th
Surname Count in Leinster in 1901: 1,362
Surname Ranking in Leinster in 1901: 136th
Surname Count in Munster in 1901: 3,339
Surname Ranking in Munster in 1901: 52nd
Surname Count in Ulster in 1901: 596
Surname Ranking in Ulster in 1901: 427th
Religion statistics for O'Brien in 1901 - Catholic: 97%, Anglican: 2%
Religion statistics for O'Brien in 1911 - Catholic: 96%, Anglican: 2%, None / Not Given: 1%
Surnames with a similar spelling as O'Brien.
The numbers in brackets represent the number of people with the given surname in 1901. If the surname is followed by a zero then it only occured in the 1911 census.
Common surnames in areas where O'Brien is also frequent:
Comment / Enquiries
Please feel free to comment or place an enquiry of interest to people with the O'Brien surname.