Cassidy
Cassidy is a girl name of Irish origin meaning “Curly-haired”, pronounced KAS-ih-dee. It ranked #541 in the United States in 2025, given to 558 babies, and peaked at #99 in 1999. Common nicknames: Cass, Cassie, Sidi.
How popular is Cassidy in the United States?
Data: U.S. Social Security Administration (SSA). Based on all Social Security card applications for births in the United States.
What does Cassidy mean, and where does it come from?
Cassidy comes from the Irish surname Ó Caiside, built on cas, "curly" — the descendants of the curly-headed one, a family who served as hereditary physicians in County Fermanagh. It arrived as a first name through American popular culture rather than through Ireland: Butch Cassidy, Hopalong Cassidy and David Cassidy all had their turn. Given mostly to girls since the 1980s, it peaked at 99th in 1999 and has drifted down since, which puts it at the stage where a name stops sounding of its moment and starts sounding simply Irish again.
How is Cassidy used around the world?
Cassidy is used in 2 languages worldwide, with 1+ international variants.
TypeUnisex name
Linguistic data: Wikidata (CC0). Variants and language usage may vary by region.
What are the nicknames for Cassidy?
Famous People Named Cassidy
- Cassidy Freeman — American actress and musician
- Cassidy Hutchinson — American former White House aide and author
- Butch Cassidy — American outlaw, leader of the Wild Bunch
Similar Names to Cassidy
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Sibling Name Ideas for Cassidy
Looking for names that pair well with Cassidy? Here are some sibling name suggestions that share a similar style and feel.
Frequently Asked Questions
What does the name Cassidy mean?
Cassidy is a girl name of Irish origin meaning "Curly-haired." Cassidy comes from the Irish surname Ó Caiside, built on cas, "curly" — the descendants of the curly-headed one, a family who served as hereditary physicians in County Fermanagh. It arrived as a first name through American popular culture rather than through Ireland: Butch Cassidy, Hopalong Cassidy and David Cassidy all had their turn.
How do you pronounce Cassidy?
Cassidy is pronounced KAS-ih-dee. Common variations include Kassidy, Cassady, Cassidi.
Is Cassidy a girl name?
Yes, Cassidy is traditionally a girl name. Popular nicknames include Cass, Cassie, Sidi.