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Cassidy

Masculine · “descendant of the curly-haired one”

Cassidy is given to both — 3,735 boys and 60,848 girls since 1880. See Cassidy as a girl nameSee other names given to both

1968high 1984
#2572 in the U.S.given to only a few children a year
rare51 boys in 2025

Cassidy is the Irish Ó Caiside — descendant of the curly-haired one — from cas, curly.

How old is the name Cassidy?

Cassidy first appears in US birth records in 1968 — 57 years ago. The typical Cassidy alive today was born around 1992, making them about 33 years old. About 3,600 people named Cassidy are estimated to be alive in the US today.

When was the name Cassidy most popular?

Cassidy peaked in 1984, reaching #665 nationally. Today it ranks #2572, 1,907 places below that high. See the whole 1984 chart.

Compare this nameMore “C” names

Lists built from the same records:

I

Where it comes from

The story of Cassidy

The Ó Caiside were hereditary physicians to the Maguire lords of Fermanagh — medicine ran in Irish families the way poetry and law did, passed down for generations. The name means descendant of the curly-haired one. Cassidy became an American given name for both sexes and is in current use.

Meaning

descendant of the curly-haired one

From the Irish Ó Caiside, built on cas, 'curly' or 'twisted'. The Ó Caiside were hereditary physicians to the Maguires of Fermanagh. The Irish is ordinary and the reading undisputed.

How the name formed

  1. cas
  2. Ó Caiside
  3. Cassidy

Related forms: Ó Caiside · Cassidey

Pronouncing Cassidy

KASS-ih-dee

Three syllables, stress on the first. Irish Ó Caiside is oh-KASH-id-eh.

Nicknames for Cassidy

Moderate

CassThe front clipping, and a short form with real use
CassieThe affectionate stretch, and a name in its own right with a real record
II

What the data says

The long climb, and where it stands now

BOYS NAMED · 1968–20251698501695119682025

US babies named Cassidy per year from 1968 to 2025
AVERAGE RANK BY DECADE#1#10#100#1000#6651960s2020s

The same years in position rather than babies

First recorded
1968
Most boys named
1984169 — the highest on record
Peak rank
#665reached in 1984
Change vs 2024
−16.4%51 in 2025, from 61
Cassidy sits in the rare tail. Its best year on record was 1984, with 169 boys. Today it is given to few enough children that it does not enter the ranked charts at all.

Rank is a position, a count is a headcount, and they move independently — a name can hold its rank while the number of babies behind it falls. Source: U.S. Social Security Administration.

Cassidy in other languages

The same name elsewhere

  • Ó Caiside in Irish — related form
  • Cassidey in English — spelling variant

Strongest US states over the last decade: California, Texas, New York.

Cassidys among us

3,600

people named Cassidy are estimated to be alive in the US today

About 1 boy in 33,492 born in 2025 was named Cassidy

Estimated from SSA birth records and published actuarial life tables. Method

Spellings of Cassidy

#2572
Cassidy on the 2025 chart
#870
counting every spelling

The SSA counts spellings, not names. Cassidy went to 51 boys in 2025, but Kassidy is the same name said out loud. Together the 2 spellings went to 58, which makes it the 870th most-given boys’ name of the year — 1,702 places above the chart.

  • Cassidy51
  • Kassidy7

About 1 boy in 29,450 born in 2025 was given one of these spellings — against 1 in 33,492 for Cassidy itself.

Spellings are grouped by a fixed rule that folds interchangeable English spellings of one sound (ck/k, ph/f, x/ks, a non-initial y for i) and keeps vowels apart, so Sean and Shawn stay separate names. It errs towards splitting: a family here is never larger than the truth. SSA national data, 2025. Method

III

Is it right for you

The Jefferey test

Every popular name lives one long story — a climb, a peak, a slow settling back. Cassidy's later chapters haven't been written yet, so we borrowed them: Jefferey climbed just as high around 1969, and its whole arc is on record. Line the two peaks up, and Jefferey's path sketches the road Cassidy is walking now.

40%chance Cassidy will feel dated by 2040
Cassidy, aligned on its peakJefferey· peak 1969not yet written
#1#10#100#1000peak-20 yrs+50 yrsJefferey · #8788Cassidy today
Cassidy today is about where Jefferey stood in 2010 — 41 years past a #665-sized peak. Within 15 years, Jefferey had drifted out of the mainstream charts.
Ages quietlysteadyDates fast

Cassidy sits in the calm middle of the cycle — neither chasing a wave nor sliding off one. Middle-of-the-cycle names age slowly and predictably.

A scored estimate from 146 years of naming cycles — not a prophecy. Great names outlive statistics. How this is scored

Where Cassidy is headed

19682030

US babies named Cassidy per year, 1968 to 2025, with a projection to 2030

Cassidy should hold steady through 2030 — the curve is flat, and flat curves are the most predictable kind.

Steady+8% by 2030projected around #2,562 in 2030

Medium confidence — fitted on official counts through 2025.

A damped-trend projection of the official birth data — a sketch of momentum, not a promise. Every name's forecast, ranked.

Cassidy beside its neighbors

The names ranked closest to Cassidy in 2025, in babies rather than position — the bars are to scale.

Cassidythis name51#2572Ripp51#2572Efraim51#2572Willem51#2572Duane51#2572

US boys given each name in 2025.

The trade-off

Practical strengths
  • That the family were hereditary physicians is a first-rate fact.
  • Cass and Cassie are two short forms, both with real records.
  • Three syllables with a front stress, which holds up against a short surname.
What to consider
  • It reads as more feminine than masculine in America.
  • It reads unmistakably as a surname.
  • Butch Cassidy is a strong American association.

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Cassidy

Masculine · #2572 in the U.S.

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Frequently asked

How many Cassidys are there in the world?
No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 3,600 people named Cassidy are estimated to be alive in the US today.
How do you spell Cassidy?
Cassidy is the most-used spelling in US records — 51 of the 58 babies given the name in 2025. The others recorded are Kassidy.
How popular is the name Cassidy in 2025?
Cassidy ranks #2572 among US boy names in 2025, with 51 babies given the name.
How rare is the name Cassidy?
About 1 in every 33,492 US boys born in 2025 was named Cassidy — 51 in all.
Will my child share the name Cassidy with classmates?
Cassidy will almost certainly be the only one in school.

Ranked beside Cassidy

Names sitting at a similar level of popularity right now.

Ripp#2572 · Efraim#2572 · Willem#2572 · Duane#2572 · Nikolaos#2572 · Nicolai#2572 · Zair#2572 · Parth#2572

Looking for what else is popular rather than what resembles Cassidy? See the current top 100.

Choosing between Cassidy and another name?

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US figures from the Social Security Administration. 1880–2025. Data & methodology

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