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How Many People Are Named Brennan?
Estimated people named Brennan living in the U.S. today
34,372
Gender distribution
94% male · 6% female in SSA records.
Name scorecard
- Total U.S. births recorded (1880–2024): 35,250
- Peak year: 2009 (1,550 births)
- Estimated living today: 34,372
Brennan by age group — who carries the name today?
Brennan popularity over time (1880–2024)
Estimated living bearers by birth decade
About the name Brennan
Brennan has been recorded by the Social Security Administration since the 19th century dataset began. In total, 35,250 babies were given the name in the United States between 1880 and 2024. After adjusting each birth cohort for survival to today, an estimated 34,372 bearers are still living — roughly 1 in 9,944 Americans. The name's strongest decade shapes how old most Brennans you meet will be, which the age-group breakdown above shows directly. All figures are statistical estimates from public records; see our methodology for sources, the survival model, and the limits of the data (names given to fewer than five babies in a year are not published by the SSA).
Frequently asked questions
How many people are named Brennan in the US?
An estimated 34,372 people named Brennan are living in the United States today, based on SSA birth records from 1880 to 2024 adjusted for survival. That makes Brennan rare — about 1 in 9,944 Americans.
Is Brennan a boy or girl name?
In SSA records, Brennan is 94% male and 6% female, so it is predominantly a male name.
When was Brennan most popular?
Brennan peaked in 2009, when 1,550 babies were given the name. Its current trend is declining compared with the previous decade.
How rare is the name Brennan?
Brennan ranks #1,140 of 104,819 first names recorded by the SSA, with a rarity score of 47 out of 100 (higher means rarer).