Kasidy
Feminine · “From the Irish surname Ó Caiside”
Kasidy is a spelling of Cassidy, an Irish surname that became an American girl's name. Its two most famous bearers were an outlaw who borrowed it and a cowboy hero whose star bought his own films and put them on television.
How old is the name Kasidy?
Kasidy first appears in US birth records in 1981 — 44 years ago. The typical Kasidy alive today was born around 2003, making them about 22 years old. About 600 people named Kasidy are estimated to be alive in the US today.
When was the name Kasidy most popular?
Kasidy peaked in 2001, reaching #3316 nationally. See the whole 2001 chart.
Lists built from the same records:
Where it comes from
From Ó Caiside to Kasidy
The story of Kasidy
Robert LeRoy Parker, a Mormon farm boy from Utah, learned horse-stealing and cattle-rustling from an older outlaw named Mike Cassidy and took his surname; as Butch Cassidy he led the Wild Bunch before fleeing to South America. William Boyd, who played the cowboy Hopalong Cassidy in dozens of films, bought the rights to them, and when he sold them to television in 1949 Hoppy became the first western hero of the new medium. Kasidy is one of the spellings American families used as Cassidy became a girl's name.
Meaningscholars disagree
From the Irish surname Ó Caiside
Cassidy comes from Ó Caiside; the personal name Caiside is often read as 'curly-haired', but the reading is not certain.
How the name formed
- Ó Caiside
- Cassidy
- Kasidy
Related forms: Ó Caiside · Cassidy
Pronouncing Kasidy
KAS-ih-dee
Three syllables with the stress on the first.
Nicknames for Kasidy
Moderate
What the data says
146 years of official birth records
The long climb, and where it stands now
The same years in position rather than babies
- First recorded
- 1981
- Most girls named
- 200141 — the highest on record
- Peak rank
- #3316reached in 2001
- Change vs 2021
- +66.7%10 in 2022, from 6
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.
Kasidy in other languages
The same name elsewhere
- Ó Caiside in Irish — related form
- Cassidy in English — spelling variant
Kasidys among us
people named Kasidy are estimated to be alive in the US today
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
Questions parents actually ask
Fashion outlook
Kasidy sits outside the current charts, and that is its own kind of answer: naming cycles can only date the names they carried up. A name this rare has no decade stamped on it — it cannot go out of fashion, because it was never in.
Based on 146 years of naming cycles. How we read them
The trade-off
- Sounds like Cassidy, a name most people know.
- A real Irish surname.
- Distinct on paper.
- Almost everyone will write Cassidy.
- The outlaw association is well known.
- It is closely tied to its era.
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Kasidy
Feminine
Frequently asked
- How many Kasidys are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 600 people named Kasidy are estimated to be alive in the US today.
- How popular is the name Kasidy in 2025?
- Kasidy is rarely given in the US today — it does not rank in the top 2000 girl names.
- Will my child share the name Kasidy with classmates?
- Kasidy will almost certainly be the only one in school.
More K names
The most-given names starting with K, all years combined.
Karen#1279 · Kimberly#302 · Kathleen#1150 · Katherine#186 · Kelly#851 · Kathryn#729 · Kayla#364 · Kathy#3249
Looking for what else is popular rather than what resembles Kasidy? See the current top 100.
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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