Cassidy

KAS·ih·dee · 3 syllables

Cassidy is distinctive.

87/100

Strong Practical Fit

Balanced across pronunciation, everyday use, lifetime fit and international use.

Name Profile

Pronunciation & Spelling
Effortless
A documented English pronunciation is on file: KAS-ih-dee.
91/100
Everyday Use
Low risk
Shortens naturally in everyday use, with three established short forms.
95/100
Growing Up
Strong lifetime fit
Works comfortably across child and adult settings.
82/100
International Use
Broad international fit
Works cleanly across the assessed languages and writing systems.
85/100

NAME DETAILS

COMMON FORMS: Cass; Cassie; Cassy
CLOSE SPELLINGS: Kassidy; Cassady; Cassidey

ORIGIN & HISTORY

About the name

'Curly-haired' — inherited from the Irish personal name Caiside, built on the Irish word element 'cas' meaning 'twisted, curly'. Cassidy itself is a surname-turned-given-name and has no independent etymology of its own beyond this inherited sense.

Ó Caiside (Irish Gaelic surname form).

POPULARITY

Cassidy over time

United States

#541RANK

Rank #541 gives national context, not a classroom forecast.

Uncommon in current U.S. usage. Ranked #541 in the U.S., 2025.

SourceU.S. Social Security Administration · 2025 release

Pronunciation & Forms

SAY IT

KAS·ih·dee

STRESS ON THE FIRST SYLLABLE

COMMON FORMS

Cass
Cassie
Cassy

CLOSE SPELLINGS

Kassidy
Cassady
Cassidey

Cultural Footprint

Originally an Irish surname (Ó Caiside, 'descendant of Caiside') borne by a family from County Fermanagh who served as hereditary physicians to the Maguire clan; like many Irish surnames, it crossed into first-name use in the United States as part of a broader late-20th-century trend of surname-derived given names.

TRACEABLE ORIGIN

Butch Cassidy, American outlawsurname/alias, not a given-name precedent

EDITORIAL SYNTHESIS

The Decision

Cassidy is spelled without unusual letter patterns, and it holds up in everyday use. Surname-dependent compatibility remains unassessed until a surname is added.

STRENGTH

A documented English pronunciation is on file. Uses standard characters that systems widely handle cleanly.

BEST FIT

Everyday Use is the strongest-scoring part of this name — no obvious nickname traps, rhymes, or initial issues detected.

FULL-NAME CHECK