Surname Maps for the OBrien Surname in Ireland
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Census Surname Maps for the OBrien 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 13,608 with the surname OBrien in Ireland in 1901 and 13,617 in 1911.
This ranks the surname 27th in 1901 and 25th in 1911.
Surname Count in Connacht in 1901: 1,422
Surname Ranking in Connacht in 1901: 78th
Surname Count in Leinster in 1901: 2,593
Surname Ranking in Leinster in 1901: 51st
Surname Count in Munster in 1901: 8,574
Surname Ranking in Munster in 1901: 7th
Surname Count in Ulster in 1901: 1,019
Surname Ranking in Ulster in 1901: 272nd
Religion statistics for OBrien in 1901 - Catholic: 98%, Anglican: 1%
Religion statistics for OBrien in 1911 - Catholic: 98%, None / Not Given: 1%, Anglican: 1%
Surnames with a similar spelling as OBrien.
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 OBrien is also frequent:
Comment / Enquiries
Please feel free to comment or place an enquiry of interest to people with the OBrien surname.