People With Last Name Brennan
The surname Brennan is of Irish origin, derived from the anglicized forms of the Irish-language surnames Ó Braonáin and Ó Branáin. Historically, it is associated with the clan Ua Braonáin (O'Brennan) from Uí Duach in Osraige, linked to the Dál Birn sept through a descendant of Cerball mac Dúnlainge. Despite some historical discrepancies regarding their lineage, with some sources suggesting a connection to the Uí Failghi tribe rather than Osraige, the surname has maintained a strong geographic presence in the barony of Idough.
According to the U.S. Census, Brennan holds the #701 position among surnames, appearing roughly 49238 times nationwide — about 17 per 100,000 people.
Our database contains over 15291 people with the last name Brennan. This surname is most commonly found in New York, Florida, Pennsylvania. We have over 13 unique first names combined with the last name Brennan in our records. The most frequent first names associated with this surname are John, James, Michael.
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