Brennan
From the Irish surname O Braonain, 'descendant of Braonan', a personal name built on braon, meaning 'drop' or 'moisture', with a diminutive ending.
Brennan in 2025
Brennan was given to 236 babies in the United States in 2025, making it the 1,988th most popular name of the year. That is roughly one in every 14,048 babies born.
The history of Brennan
Brennan reached its highest point in 2009, when 1,550 babies were given the name, ranking 445th that year.
Across the 110 years of records since 1916, 35,487 babies have been named Brennan. Half of them were born before 2003, which places the name's centre of gravity with Generation Z.
Brennan by decade
| Decade | Babies named Brennan | Best rank |
|---|---|---|
| 1910s | 5 | 7,621 |
| 1940s | 6 | 7,328 |
| 1950s | 80 | 5,015 |
| 1960s | 394 | 2,300 |
| 1970s | 1,008 | 1,619 |
| 1980s | 2,973 | 873 |
| 1990s | 8,874 | 528 |
| 2000s | 12,394 | 445 |
| 2010s | 8,170 | 487 |
| 2020s | 1,583 | 1,483 |
Where Brennan is heading
Brennan has fallen 68% over the past decade, from 730 babies in 2015 to 236 in 2025.
Names like Brennan
Names that rose and fell at the same time as Brennan.