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Cassidi

♀ Girl

How to Pronounce Cassidi

Pronounced KAS-ih-dee /ˈkæs.ɪ.di/Medium

Meaning: Cassidi respells Cassidy, an Irish surname from O Caiside, 'descendant of Caiside', a byname linked to 'clever' or 'curly-haired'.Medium

In 30 seconds: Cassidi is Cassidy with an -i ending, a spirited American respelling of the Irish surname-name tied to 'clever' or 'curly-haired' — brightest in the late nineties (said KAS-ih-dee).

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Origin MediumIrish

MeaningCassidi respells Cassidy, an Irish surname from O Caiside, 'descendant of Caiside', a byname linked to 'clever' or 'curly-haired'.

U.S. rank (2020)#8496 ↗ Rising

2020 U.S. births12 girls (0.00% of U.S. girls)

Peak year1999

Total births (all-time)≈ 863

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 comes from the Irish surname O Caiside, 'descendant of Caiside', a personal byname usually explained as 'clever' or 'curly-haired'. Once a boys' surname-name, it became a popular girls' first name in the late twentieth century; Cassidi is a modern American respelling with a trendy -i ending.

This spelling rose with Cassidy in the nineteen-nineties, peaked around 1999, and eased off as the trend cooled and simpler spellings prevailed. It reads as a late-nineties respelling rather than a name on the way back, though Cassidy itself endures.

Did you know? Cassidi crested around 1999, at the height of Cassidy's run as a lively surname-style girls' name.

Overall data confidence 66%

Behind the Name — Cassidy — Irish O Caiside; clever/curly-haired

Variations

CassidyKassidyCassidee

Nicknames

CassCassie

Famous Bearers

Famous bearers coming soon.

If you like Cassidi…

Cassidy— the standard spelling Cassidi restyles

Kassidy— a like K-spelled variant

Cassie— the short form of the name

Kennedy— a matching Irish surname-style girls' name

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Frequently Asked

What does the name Cassidi mean?

Cassidi is a respelling of Cassidy, from Irish O Caiside, linked to 'clever' or 'curly-haired'.

How do you pronounce Cassidi?

It's said KAS-ih-dee /ˈkæs.ɪ.di/ — three syllables, stress on the first.

Is Cassidi a boy or girl name?

Cassidi is used as a girl's name, a spelling of Cassidy.

How popular is Cassidi?

Cassidi is an uncommon spelling of Cassidy, most popular in the late nineteen-nineties.