# Fennessy

> English word · Proper noun

## Definitions
1. A surname from Irish.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fennessy