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Hennessy
Pronounced HEN-uh-see /ˈhɛn.ə.si/Medium
Meaning: An Anglicized form of the Irish surname O hAonghusa, 'descendant of Aonghus' (a name linked to 'one choice; one strength'). Now also widely known as a French cognac brand founded by an Irish emigrant, which we note.Low
Popularity in the U.S. · SSA data
U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.
SSA data updated May 2026. How we source & verify this data.
History & Origin
Hennessy anglicizes the Irish O hAonghusa, 'descendant of Aonghus'. It's carried as a surname-turned-first-name and is also widely recognized as a cognac brand, which we note (said 'HEN-uh-see').
As a first name it is rare in the U.S., reading as an Irish surname pick. Rare, Irish, and brand-tinged.
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Frequently Asked
What does the name Hennessy mean?
Hennessy is an Irish surname meaning 'descendant of Aonghus'; it's also well known as a cognac brand, which we note.
How do you pronounce Hennessy?
It's said HEN-uh-see /ˈhɛn.ə.si/ — three syllables, stress on the first.
Is Hennessy a boy or girl name?
Hennessy is used here as a boy's name, though it also appears for girls.
How popular is Hennessy?
Hennessy is rare as a first name in the U.S., more familiar as a surname and brand.