Cassidee
Feminine · “descendant of the curly-haired one”
Cassidee is an Irish surname with an American ending. Ó Caiside was a family of physicians in Fermanagh, and the element inside the name is generally read as curly — a description of hair that hardened into a lineage. The doubled e at the end does one job: it marks the name as a daughter's, on the same principle that gives Aimee and Renee their shape.
How old is the name Cassidee?
Cassidee first appears in US birth records in 1981 — 44 years ago. The typical Cassidee alive today was born around 2004, making them about 21 years old. About 800 people named Cassidee are estimated to be alive in the US today.
When was the name Cassidee most popular?
Cassidee peaked in 1997, reaching #3302 nationally. Today it ranks #13208, 9,906 places below that high. See the whole 1997 chart.
Lists built from the same records:
Where it comes from
From cas to Cassidee
The story of Cassidee
Cassidy reached America with Irish emigration and stayed a surname for a century before moving to the front of the name. What moved it was visibility: an outlaw in a film, a cowboy in a television series, and a singer on the covers of magazines all carried it in the second half of the twentieth century, and by the 1980s it was being given to daughters in real numbers. The -ee spelling belongs to that moment. It is one of several ways American naming marks a surname as a girl's name, and it works by making the last syllable unmistakable.
Meaningscholars disagree
descendant of the curly-haired one
The Irish surname Ó Caiside is built on a personal name usually derived from cas, meaning curly or twisted — a description of hair. That is the standard reading and it is not certain; a rival account connects the element to a word for ingenious. The Cassidys of Fermanagh were hereditary physicians to the Maguires, which is documented and is more interesting than either etymology.
How the name formed
- cas
- Ó Caiside
- Cassidy
- Cassidee
Related forms: Ó Caiside
Pronouncing Cassidee
KASS-ih-dee
Three syllables, stress on the first. The -ee ending is said exactly as the -y is in the standard spelling, so nothing changes audibly; the doubled e is doing visual work only.
Nicknames for Cassidee
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
- 201438 — the highest on record
- Peak rank
- #3302reached in 1997
- Change vs 2024
- 0.0%6 in 2025, 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.
Cassidee in other languages
The same name elsewhere
- Ó Caiside in Irish — same name
Cassidees among us
people named Cassidee are estimated to be alive in the US today
About 1 girl in 267,878 born in 2025 was named Cassidee
Estimated from SSA birth records and published actuarial life tables. Method
Is it right for you
What happens to a name after it peaks
The Nickey test
Every popular name lives one long story — a climb, a peak, a slow settling back. Cassidee's later chapters haven't been written yet, so we borrowed them: Nickey climbed just as high around 1957, and its whole arc is on record. Line the two peaks up, and Nickey's path sketches the road Cassidee is walking now.
Cassidee 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
Cassidee beside its neighbors
The names ranked closest to Cassidee in 2025, in babies rather than position — the bars are to scale.
US girls given each name in 2025.
The trade-off
- Cass, Cassie and Dee are all available and sound nothing like one another.
- It has a documented Irish family behind it who were physicians for generations.
- Three syllables that any English speaker reads correctly on sight.
- Cassidy is the standard spelling and will be substituted on nearly everything.
- The name is strongly associated with a particular decade of American naming.
- It reads as a surname first to older adults, which colors introductions.
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Cassidee
Feminine · #13208 in the U.S.
Frequently asked
- How many Cassidees are there in the world?
- No country counts the world's names, so there is no worldwide figure — anyone quoting one is estimating. About 800 people named Cassidee are estimated to be alive in the US today.
- How popular is the name Cassidee in 2025?
- Cassidee ranks #13208 among US girl names in 2025, with 6 babies given the name.
- How rare is the name Cassidee?
- About 1 in every 267,878 US girls born in 2025 was named Cassidee — 6 in all.
- Will my child share the name Cassidee with classmates?
- Cassidee will almost certainly be the only one in school.
Ranked beside Cassidee
Names sitting at a similar level of popularity right now.
John#13208 · Vinnie#13208 · Margery#13208 · Jossie#13208 · Tressa#13208 · Erie#13208 · Bernadine#13208 · Euna#13208
Looking for what else is popular rather than what resembles Cassidee? See the current top 100.
Choosing between Cassidee and another name?
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US figures from the Social Security Administration. 1880–2025. Data & methodology
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