How Many People Are Named Hennessey?
people named Hennessey are alive in the United States today (estimate)
About 1 in 899,433 people in the US has this name
Based on 383 babies named Hennessey in Social Security records from 1992 to 2024, and the share of each birth year still alive in 2025.
Popularity Rank
💎💎 Very Rare
Peak Year
27 births
Trend
Stable (last 10 years)
⚧ Gender Distribution
All of the babies given the name Hennessey in the records were girls.
👥 Age Distribution
The average person named Hennessey alive today is about 16 years old, and 99% are under 30. Half of them were between 9 and 22 in 2025.
📈 Popularity Over Time
Hennessey first appears in the records in 1992 and was given most often in 2015, to 27 babies. The last year it was given to at least 5 babies of one sex was 2024.
Babies given the name each year, 1992 to 2024
🏆 Rank History
Hennessey has never been one of the 100 most popular girls' names. Its best rank was #5,035, in 2015.
| Girls | |
|---|---|
| Rank in 2025 | Not ranked |
| Best rank | #5,035 (2015) |
| Years in the top 100 | None |
| Rank in its biggest decade | #7,511 in the 2000s |
📍 State-Wise Distribution
People named Hennessey alive today, by the state where they were born (estimate; state records start in 1910).
More people named Hennessey were born in California than in any other state: about 17 of those alive today.
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