Hennessey

H4E1N1N1E1S1S1E1Y4

proper noun

A surname from Irish.

OriginIrish Ó hAonghusa →
Less commonScrabble 15
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Meanings

proper noun
  1. A surname from Irish.

Origin

  1. IrishÓ hAonghusa“descendant of Angus”
  2. EnglishHennessey

Anglicized from Irish Ó hAonghusa (“descendant of Angus”).

More words from Irish

Full word history & related roots →
Cite this entry
APA

Hennessey. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Hennessey

MLA

“Hennessey.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Hennessey. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Hennessey,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Hennessey.

Source: Hennessey on Wiktionary, CC BY-SA 4.0.