Hennessey

Meaning & origin

Hennessey first appeared as a given name in the United States in 1992, entering at a time when surname-style names were gaining traction for girls. It reached its peak rank in 2015, when it ranked 2550 and was given to 47 babies. However, since 2016 its usage has declined steadily, and by 2025 it has become extremely rare, given to fewer than 5 newborns. The name's trajectory reflects a classic one-hit rise and fall, typical of names that briefly catch on but do not sustain broad appeal. Despite its Irish surname roots and association with the well-known cognac brand, Hennessey remains a niche choice, most common in the 2010s. No single state has recorded a high enough concentration to appear in top-states data, underscoring its scattered, low-frequency usage across the country.

Hennessey is a modern given name derived from the Irish surname Hennessy, which itself comes from the Gaelic Ó hAonghusa, meaning 'descendant of Aonghus'. The root Aonghus is an ancient Irish name composed of 'aon' meaning 'one' and 'gus' meaning 'choice' or 'vigor'. The surname was first recorded in County Cork, Ireland. As a first name, Hennessey emerged in the United States in the 1990s, likely influenced by the popularity of surname-style names and the recognizable cognac brand Hennessy. Its usage as a girl's name became notable, peaking in 2015.