# Cassidy

> English word · Proper noun · IPA /ˈkæsɪdi/ · frequency rank #15,361

## Definitions
1. A surname from Irish anglicized from Ó Caiside (“descendant of Caiside”). Caiside is a byname from Irish cas (“curly”) meaning “curly-haired”.
2. A surname from Irish, a rare anglicization of Mac Casarlaigh (Casserly).
3. A male given name transferred from the surname.
4. A female given name transferred from the surname, of modern American usage.
5. A community in southern Vancouver Island, British Columbia, Canada.

## Etymology
From the Irish surname, Anglicized from Ó Caiside (“descendant of Caiside”), from cas (“curly-haired”).

## Easily confused with
- **Cassie** (https://plainspell.com/en/vs/cassidy-vs-cassie)
- **Cassius** (https://plainspell.com/en/vs/cassidy-vs-cassius)
- **Cassini** (https://plainspell.com/en/vs/cassidy-vs-cassini)
- **classify** (https://plainspell.com/en/vs/cassidy-vs-classify)

## Common misspellings (9)
`acssidy`, `casidy`, `casisdy`, `cassdiy`, `cassiddy`, `cassidyy`, `cassiyd`, `ccassidy`, `csasidy`

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