Modern variation of Hennessy, meaning descendant of Angus
Jennessy is a modern American invention, likely created by blending the popular 'Jen-' prefix with the surname-turned-given-name Hennessy. The root name Hennessy is an Anglicized form of the Irish Ó hAonghusa, which denotes a descendant of Aonghus (Angus), a name traditionally interpreted as 'one strength'.
Fewer than 5 girls were named Jennessy in 2025.
US births per 5-year period, 1990–present (SSA data).
