Brennan
4% girls · 96% boys
About Brennan
Brennan is a winning Irish surname name, more modern than Brian or Brendan, more unusual than Conor and Aidan. The only possible problem with Brennan: people might think you're saying Brendan.
Brennan for boys#1003 US
Brennan eased onto the very bottom of the popularity list in 1966, and has pretty much remained in the Top 1000 ever since.
Brennan for girls#9557 US
Brennan is an Irish last name that could join the group of similar names now ranking among the top Irish names for baby girls in the US: Riley, Kennedy, and Quinn. Currently, only 16 baby girls were named Brennan versus over 200 boys, but those numbers could well become more equal.
Pronounced BREN-un.
As of October 2026, Brennan ranked #1003 for boys and #9557 for girls in US births in 2025 SSA, peaked at #242 for boys in 2009 and #1867 for girls in 1994.
Popularity & trends
Data table
| Year | US rank · boys | Births · boys | US rank · girls | Births · girls |
|---|---|---|---|---|
| 2014 | #387 | 806 | #2,973 | 57 |
| 2015 | #444 | 690 | #3,782 | 40 |
| 2016 | #534 | 549 | #4,175 | 35 |
| 2017 | #585 | 464 | #3,493 | 44 |
| 2018 | #661 | 382 | #4,575 | 30 |
| 2019 | #719 | 340 | #4,358 | 32 |
| 2020 | #764 | 315 | #4,280 | 32 |
| 2021 | #872 | 265 | #4,528 | 30 |
| 2022 | #995 | 224 | — | 0 |
| 2023 | #1,023 | 213 | — | 0 |
| 2024 | #1,054 | 207 | — | 0 |
| 2025 | #1,003 | 226 | — | 0 |
World rankings
Brennan for boys
Similar names
These 40 names were selected by our users looking for other names like Brennan.
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Brennan on lists
Famous Brennans
- Brennan CarrollBoy
American football coach; son of coach Pete Carroll
- Brennan ElliottBoy
Canadian actor
- Brennan Marcel WilliamsBoy
American pro wrestler and NFL player
- Brennan Philip BoeschBoy
American baseball player
- Brennan EvansBoy
Canadian ice hockey player
- Brennan PooleBoy
American NASCAR driver
- Brennan NewberryBoy
American NASCAR driver
- Brennan Kerwin (b. 1995)Boy
son of Brian Kerwin & Jeanne Marie Troy
- Brennan Rhys Robinson (b. 2001)Boy
son of singer Scott Robinson of boy band 5ive
- John Owen BrennanBoy
CIA director
- William Brennan Jr.Boy
United States Supreme Court Justice
- Shane BrennanBoy
American TV producer
- Brennan Lee MulliganBoy
American comedian, actor, writer, and gamemaster
- Kiernan Brennan "Kiki" ShipkaGirl
child actress (plays Sally Draper on 'Mad Men' & Cathy in the TV movie 'Flowers in the Attic')
Brennan in pop culture
- Brennan HuffBoy
character on the film "Step Brothers" played by Will Ferrell
- Ray BrennanBoy
character on TV's "Las Vegas"
- "Brennan of the MoorBoy
" 1913 film about the title character, a Robin Hood,type hero
- Temperance BrennanGirl
main character on TV show "Bones"