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Cassidy
♂ Boy
Pronounced KAS-ih-dee /ˈkæs.ɪ.di/High
Meaning: curly-haired, descendant of CaisideMedium
In 30 seconds: Cassidy is an Irish surname meaning descendant of Caiside or curly-haired. A lively three-syllable name used for both boys and girls, with an upbeat Western American spirit.
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Origin HighIrish
Meaningcurly-haired, descendant of Caiside
U.S. rank (2025)#2575 ↘ Falling
2025 U.S. births51 boys (0.00% of U.S. boys)
Peak year1984
Total births (all-time)≈ 3,735
Popularity in the U.S. · SSA data
U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.
SSA data updated May 2026. How we source & verify this data.
History & Origin
Cassidy is from Irish O Caiside meaning descendant of Caiside, where the personal name may relate to curly hair.
Cassidy is used for both boys and girls in the US.
Did you know? Butch Cassidy (born Robert LeRoy Parker, 1866–1908) was the famous American outlaw and train robber — and the 1969 film Butch Cassidy and the Sundance Kid made this name synonymous with cool frontier adventure.
Overall data confidence 82%
Behind the Name: Cassidy — name etymology referenceUS Social Security Name Database — U.S. popularity data
Variations
KassidyCasidy
Nicknames
CassCassie
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Frequently Asked
What does Cassidy mean?
Cassidy means curly-haired, descendant of Caiside.
How do you pronounce Cassidy?
Cassidy is pronounced KAS-ih-dee (/ˈkæs.ɪ.di/), with 3 syllables.
Is Cassidy a boy's name?
Yes, Cassidy is used as a boy's name.
How popular is the name Cassidy?
Irish surname; curly-haired/Caiside meaning well established. Used as boy per spec.