Cassidy: Meaning, origin and popularity

Pronounced KAS-ih-dee · 3 syllables

Cassidy means “descendant of Caiside; curly-haired”, from Irish.

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

How popular is Cassidy?

Cassidy was the #541 name in the US in 2025, given to 609 babies. It’s used less than it was: down 49% on 2011–2015. It peaked around 1990.

Babies named Cassidy in the US by five-year period, relative to its peak (around 1990).

Half of US adults named Cassidy are older than 27; most are between 19 and 41. (Estimated from US births by year and life tables.)

Names that real brothers and sisters of people named Cassidy have, from family records on Wikidata, most common first.

Chosen by the same families or with a similar style and era.

Cassidy means “descendant of Caiside; curly-haired”. It comes from Irish.

Cassidy is pronounced KAS-ih-dee.

Cassidy was the #541 name in the US in 2025, given to 609 babies. It’s used less than it was: down 49% on 2011–2015. It peaked around 1990.

Half of US adults named Cassidy are older than 27. Most are between 19 and 41.