How Many People Are Named Brennan?
people named Brennan are alive in the United States today (estimate)
About 1 in 9,874 people in the US has this name
Based on 35,487 babies named Brennan in Social Security records from 1916 to 2025, and the share of each birth year still alive in 2025.
Popularity Rank
💎 Rare
Peak Year
1,550 births
Trend
Stable (last 10 years)
📖 Name Origin & Meaning
Meaning:
From an Irish surname derived from Ó Braonáin meaning "descendant of Braonán". Braonán is a byname meaning "rain, moisture, drop" (with a diminutive suffix).
Source of the meaning, origin, pronunciation and related names: Behind the Name.
Related & Similar Names
⚧ Gender Distribution
Of the babies given the name Brennan, 6.3% were girls and 93.7% were boys. The share has stayed close to this since the 1960s: 0% of the babies were girls then and 8.4% in the 2020s.
👥 Age Distribution
The average person named Brennan alive today is about 23 years old, and 75% are under 30. Half of them were between 15 and 29 in 2025.
📈 Popularity Over Time
Brennan first appears in the records in 1916 and was given most often in 2009, to 1,550 babies. In 2025, 236 babies got the name.
Babies given the name each year, 1916 to 2025
🏆 Rank History
Brennan has never been one of the 100 most popular boys' names. Its best rank was #242, in 2009. In 2025 it ranked #1,003.
| Boys | |
|---|---|
| Rank in 2025 | #1,003 |
| Best rank | #242 (2009) |
| Years in the top 100 | None |
| Rank in its biggest decade | #279 in the 2000s |
📍 State-Wise Distribution
People named Brennan alive today, by the state where they were born (estimate; state records start in 1910).
More people named Brennan were born in California than in any other state: about 2,662 of those alive today. Compared with the national rate in the same years, Brennan was given 4 times as often in Louisiana, 2.2 times in Hawaii and 1.6 times in Michigan.
Look up another name
⊙ We don't save the names you search.