Fennessy

F4E1N1N1E1S1S1Y4

proper noun

A surname from Irish.

OriginIrish Ó Fionnghusa →
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Meanings

proper nounFennessy (plural Fennessys)

plural Fennessys · alternative Fennessey

  1. A surname from Irish.

Origin

  1. IrishÓ Fionnghusa“descendant of Fionnghus”
  2. EnglishFennessy

Reduced Anglicized form of Irish Ó Fionnghusa (“descendant of Fionnghus”), a personal name based on fionn (“fair, white”) + gus (“vigor, force”).

More words from Irish

Full word history & related roots →
Cite this entry
APA

Fennessy. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/Fennessy

MLA

“Fennessy.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Fennessy. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “Fennessy,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/Fennessy.

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