Surname Maps for the O'Sullivan Surname in Ireland
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Census Surname Maps for the O'Sullivan 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 2,375 with the surname O'Sullivan in Ireland in 1901 and 2,698 in 1911.
This ranks the surname 343rd in 1901 and 299th in 1911.
Surname Count in Connacht in 1901: 91
Surname Ranking in Connacht in 1901: 538th
Surname Count in Leinster in 1901: 191
Surname Ranking in Leinster in 1901: 585th
Surname Count in Munster in 1901: 2,045
Surname Ranking in Munster in 1901: 100th
Surname Count in Ulster in 1901: 48
Surname Ranking in Ulster in 1901: 903rd
Religion statistics for O'Sullivan in 1901 - Catholic: 99%, None / Not Given: 1%, Anglican: 1%
Religion statistics for O'Sullivan in 1911 - Catholic: 98%, None / Not Given: 1%, Anglican: 1%
Surnames with a similar spelling as O'Sullivan.
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'Sullivan is also frequent:
Comment / Enquiries
Please feel free to comment or place an enquiry of interest to people with the O'Sullivan surname.