Etymology

Fennessy

F4E1N1N1E1S1S1Y4

Today it means: A surname from Irish. Full definition →

Irish Ó Fionnghusa
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The story

  1. Irish · derived fromÓ Fionnghusa“descendant of Fionnghus”
  2. English todayFennessy

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

Etymology from Wiktionary, CC BY-SA 4.0.