Cassidy

• (surname from Ó Caiside): Casady, Cassda, Casada, Cassaday, Cassady, Cassedy, Cassady, Cassiday
• (female given name): Kassidy

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

• (US) IPA^(key): /ˈkæsɪdi/, /ˈkæsədi/

Cassidy

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.

• Seaver-Cassidy syndrome
• (diminutive): Cass, Cassie