How Many People Are Named Obrien?
people named Obrien are alive in the United States today (estimate)
About 1 in 1,752,742 people in the US has this name
Based on 209 babies named Obrien in Social Security records from 1921 to 2022, and the share of each birth year still alive in 2025.
Popularity Rank
💎💎 Very Rare
Peak Year
16 births
Trend
Stable (last 10 years)
⚧ Gender Distribution
All of the babies given the name Obrien in the records were boys.
👥 Age Distribution
The average person named Obrien alive today is about 30 years old, and 65% are between 30 and 59. Half of them were between 20 and 37 in 2025.
📈 Popularity Over Time
Obrien first appears in the records in 1921 and was given most often in 1991, to 16 babies. The last year it was given to at least 5 babies of one sex was 2022.
Babies given the name each year, 1921 to 2022
🏆 Rank History
Obrien has never been one of the 100 most popular boys' names. Its best rank was #3,761, in 1991.
| Boys | |
|---|---|
| Rank in 2025 | Not ranked |
| Best rank | #3,761 (1991) |
| Years in the top 100 | None |
| Rank in its biggest decade | #5,306 in the 1980s |
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