How Many People Are Named Hennessy?
An estimated 1,575 people in the United States have the first name Hennessy. It is predominantly female (96.1%). The average bearer is 15 years old, and Hennessy peaked in popularity in 2019 with 82 births that year.
Below you will find a full statistical profile of Hennessy as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Hennessy paired with any surname.
Key Insights
- While Hennessy is overwhelmingly female, 62 male births have been registered with this name since 1880.
- Hennessy is a modern name. With an average bearer age of just 15, it has gained most of its popularity in recent years.
Estimated Living Americans
1,575
About 1 in 217,622 people in the U.S.
Rarity
Rare
Predicted Gender
Female
96.1% confidence
Average Age
15
years old
Peak Year
2019
82 births
Total Registered
1,593
since 1880
Gender Distribution for Hennessy
Hennessy is predominantly female (96.1%), though 62 male births have been registered. It functions as a unisex name for a small percentage of bearers.
Hennessy as a male name
Ranked #11,397 in 2024
6 male births in 2024
Peak: 1996 (7 births)
Hennessy as a female name
Ranked #3,524 in 2024
44 female births in 2024
Peak: 2019 (82 births)
Hennessy: Popularity Over Time
SSA records for Hennessy span from the 1990s to the 2020s, covering 4 decades of naming data. The most popular decade for this name was the 2010s, when 601 babies were registered. While Hennessy is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Hennessy by Decade
How has Hennessy tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Hennessy by State
Birth registrations for Hennessy span all 7 states and territories in the SSA database. The highest counts are in California, Texas, New York. The lowest are in Washington, Nevada, Arizona. On average, about 117 Hennessys were registered per state.
Hennessy + Last Name Combinations
How many people share a full name with Hennessy as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Hennessy
Other first names starting with H with a similar number of bearers.
Hennessy: Questions and Answers
How many people in the U.S. are named Hennessy?
We estimate approximately 1,575 people named Hennessy are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 217,622 Americans share this first name.
Is Hennessy a common name?
Hennessy is classified as "Rare" and is more popular than 92.7% of all first names in the SSA database. A total of 1,593 births have been registered with this name since 1880.
When was Hennessy most popular?
Hennessy reached peak popularity in 2019, when 82 babies were given this name. The average age of a living person named Hennessy is approximately 15 years old, reflecting when the name was most commonly given.
Is Hennessy a female name?
Hennessy is predominantly female. 96.1% of people with this name are female. See the gender breakdown above for full details.
How many Hennessy Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Hennessy Smith, Hennessy Johnson, Hennessy Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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