Hennessey
Hennessey was last recorded in 2024, when 5 babies were given it; 383 Americans have been recorded with it between 1992 and 2024 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Hennessey by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Hennessey?
Unranked in 2025
Its last girls’ rank on record is #16,183, in 2024; SSA lists a name only in years with 5 or more births.
27 babies in 2015, the peak
Hennessey peaked in 2015, when 27 girls were given it, #5,035 among girls’ names. It was not recorded in 2025.
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2024 | 5 | #16,183 | 3.1 |
| 2023 | 11 | #9,222 | 6.9 |
| 2022 | 9 | #10,689 | 5.5 |
| 2021 | 14 | #7,776 | 8.5 |
| 2020 | 12 | #8,598 | 7.4 |
| 2019 | 11 | #9,339 | 6.6 |
| 2018 | 7 | #12,965 | 4.1 |
| 2017 | 12 | #8,980 | 7.0 |
| 2016 | 15 | #7,743 | 8.5 |
| 2015 | 27 | #5,035 | 15.1 |
Every recorded year (30)
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2014 | 12 | #9,181 | 6.7 |
| 2013 | 12 | #9,230 | 6.8 |
| 2012 | 11 | #9,959 | 6.2 |
| 2011 | 13 | #8,815 | 7.4 |
| 2010 | 13 | #8,899 | 7.3 |
| 2009 | 23 | #5,965 | 12.5 |
| 2008 | 14 | #8,673 | 7.4 |
| 2007 | 13 | #9,191 | 6.8 |
| 2006 | 14 | #8,410 | 7.4 |
| 2005 | 15 | #7,646 | 8.1 |
| 2004 | 19 | #6,319 | 10.3 |
| 2003 | 14 | #7,724 | 7.7 |
| 2002 | 14 | #7,557 | 7.8 |
| 2001 | 16 | #6,728 | 8.9 |
| 2000 | 11 | #8,777 | 6.1 |
| 1999 | 8 | #10,696 | 4.5 |
| 1998 | 17 | #5,887 | 9.6 |
| 1997 | 10 | #8,569 | 5.7 |
| 1996 | 6 | #12,377 | 3.4 |
| 1992 | 5 | #14,046 | 2.7 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Hennessey a boy’s or a girl’s name?
Hennessey has been recorded only for girls: SSA lists no boys with the name in 30 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Hennessey: the SSA national file counts each sex separately.
How many people are named Hennessey, and how old are they?
An estimated 379 Americans named Hennessey and born in the U.S. are alive in 2026 (99% of everyone recorded); the median is 17 years old and half are between 10 and 23. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 358 people named Hennessey (310 women and girls, 48 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 332 born in the U.S. The Census count is 8% above that prediction.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
How common is the spelling Hennessey?
Hennessey is a less common spelling of Hennessy: SSA has recorded 383 Hennessey and 1,630 Hennessy since 1880.
Of these 4 names spelled alike, given to 2,259 babies since 1880, Hennessey is the second most given (17% of them). In 2025 none of their 37 babies recorded by SSA was a Hennessey (SSA lists a name only with 5 or more babies of one sex).
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Hennessey
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Hennessey and names like it
- Compare Hennessey and HennessyBirths, ranks, peak and the living estimate side by side.
- The most given names of the 2010sHennessey peaked in 2015.
- California’s most given namesThe state where SSA recorded the most babies named Hennessey since 1910.
- The top names of 2015The year the most babies were named Hennessey.
- The names of Generation ZMost people named Hennessey alive today were born 1997-2012.
- Names starting with HMost given first.