Within the UK and Ireland, the surname Brennan is one of the most popular; frequently occuring in Ireland where it is carried by 1 in every 199 people. The majority of those with the family name of Brennan are to be found living in/around Leinster (approx. 32% of all UK Brennan's), Ulster and Munster. The name can also be found in England with 1 in 2,875 people using it.
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