UK girl's name
Hennessy
A French given name related to the Irish surname of disputed meaning.
For 2026, the newest official UK baby-name figures on this page are from 2021. That release is the current official benchmark rather than a forecast.
Hennessy is a girl's name in the UK records. People looking for Hennessy popularity in 2026 should use the latest official release, which is 2021 in this profile. In that release it ranked #5581, with 3 babies registered with the name. Its strongest year in the published records was 2015, with 5 births.
This profile covers 20 England and Wales registrations across 6 recorded years from 2009 to 2021. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.
The latest count is about 60% of the recorded peak, which gives a quick read on how the name has moved since its high point.
We estimate that about 20 living people in the UK are called Hennessy. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2022 or 2026.
Key insights
- • Hennessy ranked #5581 for girls in England and Wales in 2021, with 3 registrations.
- • The name peaked in 2015, when 5 girls were registered as Hennessy.
- • About 20 living people in the UK are estimated to have Hennessy as a first name, after adjusting past birth registrations with ONS life tables.
Latest rank (E&W)
#5581
2021
Births in 2021
3
Latest year
Peak year
2015
5 births
Estimated living
20
2026
Meaning
What does Hennessy mean?
The given name Hennessy has its origins in the Irish Gaelic language and culture. It is believed to have derived from the old Irish words "Oan" meaning "one" and "Oisin" meaning "young deer" or "fawn". The earliest recorded spelling of the name was Oenghus, which later evolved into Angus and eventually Hennessy.
The name Hennessy has been documented in ancient Irish texts and manuscripts, such as the Annals of Ulster and the Book of Leinster, dating back to the 6th and 12th centuries respectively. These sources suggest that the name was borne by several influential figures in early Irish history, including kings, warriors, and poets.
One of the earliest documented individuals with the name Hennessy was Oenghus Olmucaid, a legendary Irish warrior and king who is said to have lived in the 2nd century AD. Another notable bearer of the name was Oenghus mac Nad Froích, the semi-legendary King of Munster who ruled in the 5th century AD.
In the 12th century, Oenghus Ua Laidgnen was an Irish poet and historian who authored several works, including the Lebor Bretnach (The Irish Celtic Vernacular). During the same period, Oenghus Ó Dálaigh was a renowned Irish poet and Chief Ollamh (head poet) of Ireland.
In more recent times, one of the most famous individuals with the name Hennessy was Richard Hennessy, an Irish soldier and entrepreneur who founded the Hennessy Cognac distillery in France in the late 18th century. Another notable bearer of the name was John Hennessy, an Irish-American politician who served as the 19th Governor of New Hampshire from 1857 to 1859.
Other significant individuals with the given name Hennessy include Hennessy Youngman (1911-1998), an American comedian and actor, and Hennessy Lopes-Baptista (born 1996), a Portuguese professional footballer who currently plays for Paços de Ferreira.
Sourced from namecensus.com.
Popularity
Hennessy over time
The chart below shows babies named Hennessy registered in England and Wales in the years where the name appears in the published records, from 2009 to 2021. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.
For Hennessy, the clearest high point is 2015. The latest England and Wales figure is 3 births in 2021, compared with 5 at the peak.
Babies born per year
Decades
Hennessy by decade
Decade totals smooth out the yearly jumps and make it easier to see whether Hennessy was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.
| Decade | Average rank | Total births | Years covered |
|---|---|---|---|
| 2020s | #5537 | 6 | 2 |
| 2010s | #5185 | 11 | 3 |
| 2000s | #5556 | 3 | 1 |
Related
Names similar to Hennessy
- Hannah 67,635
- Holly 52,307
- Harriet 24,781
- Hollie 17,902
- Harper 15,784
- Heidi 12,675
- Hallie 9,873
- Hope 9,414
- Hayley 5,968
- Hazel 5,954
- Hanna 5,735
- Heather 5,497
FAQ
Hennessy: questions and answers
How popular is the name Hennessy in the UK right now?
In 2021, Hennessy was ranked #5581 for girls in England and Wales, with 3 births registered.
When was Hennessy most popular?
The peak year on record was 2015, with 5 babies registered as Hennessy in England and Wales.
What is the meaning and origin of Hennessy?
A French given name related to the Irish surname of disputed meaning.
How many people are called Hennessy in the UK?
A total of 20 babies have been registered as Hennessy across the 6 years of ONS England & Wales records shown here.
Which records is this page based on?
The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.