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Home › Baby Names Directory › Casidy

Casidy

♀ Girl

How to Pronounce Casidy

Pronounced KAS-ih-dee /ˈkæsɪdi/Medium

Meaning: Casidy is a single-s respelling of Cassidy. The parent is an Irish surname, anglicised from O Caiside, 'descendant of Caiside,' a byname linked to curly or clever hair. Adopted as a girls' first name in the late twentieth century, it keeps that surname-name feel in a trimmed spelling.Low

In 30 seconds: Casidy is a respelling of Cassidy, an Irish surname meaning 'descendant of Caiside' (said KAS-ih-dee).
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Origin LowAmerican, Irish
MeaningCasidy is a single-s respelling of Cassidy. The parent is an Irish surname, anglicised from O Caiside, 'descendant of Caiside,' a byname linked to curly or clever hair. Adopted as a girls' first name in the late twentieth century, it keeps that surname-name feel in a trimmed spelling.
U.S. rank (2016)#13172 ↗ Rising
2016 U.S. births7 girls (0.00% of U.S. girls)
Peak year2001
Total births (all-time)≈ 346
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Popularity in the U.S. · SSA data

peak 200119802016

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

Casidy is an American respelling of Cassidy recorded from around 1980. The surname Cassidy became a popular unisex-leaning-female first name in that era, and Casidy is one of its lighter spelling variants.

It was always uncommon in this form, given to only a couple dozen girls a year around its early-2000s high, while Cassidy was far more common. A girl named Casidy then is in her twenties now.

Did you know? Cassidy, the name Casidy trims, jumped in popularity for girls after the 1970s, helped by its bright, friendly sound.
Overall data confidence 50%
References - Casidy — Respelling of Cassidy; Irish 'descendant of Caiside'

Variations

CassidyCassideyKasidy

Nicknames

CassCassie

Famous Bearers

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If you like Casidy…

Cassidy— the standard name Casidy respells
Kennedy— a like Irish surname-name
Kasey— a similar breezy girls' name
Cadence— another modern rhythmic pick

Explore names like Casidy

By thememodernrespellingirish

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Frequently Asked

What does the name Casidy mean?

It is a respelling of Cassidy, an Irish surname meaning 'descendant of Caiside.'

How do you pronounce Casidy?

It's said KAS-ih-dee /ˈkæsɪdi/, three syllables, stress on the first.

Is Casidy a boy or girl name?

Casidy is used as a girl's name.

Is Casidy a popular name?

No, this spelling has always been rare, though Cassidy itself was popular.

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