Hannah Girl
HA-nuh
“grace, favor” · Hebrew
#56
Cassidy
GirlIrish· “possibly curly-haired”
- Meaning
- possibly curly-haired (origin disputed)
- Origin
- Irish
- Pronunciation
- KAS-ih-dee
- Syllables
- 3
- US rank 2025
- #541
- US babies 2025
- 558
- Best rank
- #99 (1999)
- Peak year
- 1999
Meaning and origin of Cassidy
Cassidy is often said to mean “possibly curly-haired”; the origin is uncertain, though it is usually linked to Irish roots.
Cassidy comes from the Irish surname Ó Caiside, meaning "descendant of Caiside." The meaning of Caiside is uncertain; it is often said to mean "curly-haired," from the Irish cas, but this is not settled. The Cassidy family was known in medieval Ireland as hereditary physicians in County Fermanagh. As a first name Cassidy became popular in the United States in the late twentieth century, used for both girls and boys, and the outlaw Butch Cassidy gave it a Wild West association. It has a lively, friendly sound, and Cass and Cassie are easy nicknames.
Popularity over time
Cassidy first appears in US Social Security records in 1969. It has ranked in the top 1,000 in 45 different years, starting in 1981. Its best national rank was #99 in 1999, the same year it reached its highest count of 3,395 babies. In 2025, 558 babies were named Cassidy, and it ranked #541 nationally. That is 55% fewer than ten years earlier, so it is becoming less common.
Its national rank moved from #1,077 in 1980, #107 in 2000, #251 in 2010, and #541 in 2025. Of the 60,848 US girls named Cassidy since records began, 35% were born in the 2000s, its biggest decade. The 1990s come next, with 20,659 babies. Since 2010, 15,140 more have been named Cassidy.
Other girls' names that peaked around the same time include Caitlyn, Mikayla, Kiara, Autumn, and Summer.
Where it is most popular (2025)
In 2025, Cassidy ranked highest in Pennsylvania, Colorado, and New Jersey.
| State | Rank there | Babies |
|---|---|---|
| Pennsylvania | #295 | 37 |
| Colorado | #321 | 19 |
| New Jersey | #353 | 23 |
| Michigan | #375 | 23 |
| Virginia | #416 | 19 |
Gender, sound and spelling
About 95% of US babies named Cassidy over the last 20 years were girls, with a small share of boys.
Cassidy is usually pronounced KAS-ih-dee, with three syllables. It has seven letters, starts with C and ends in “-dy”.
Middle names for Cassidy
A few middle names that flow with Cassidy: each avoids a matching first letter, a rhyme and a vowel clash where the names meet.
Sibling names for Cassidy
Similar names
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Lists that include Cassidy
Frequently asked questions
What does the name Cassidy mean?
Cassidy is often said to mean “possibly curly-haired”; the origin is uncertain, though it is usually linked to Irish roots.
What is the origin of the name Cassidy?
Cassidy has Irish roots. Cassidy comes from the Irish surname Ó Caiside, meaning "descendant of Caiside." The meaning of Caiside is uncertain; it is often said to mean "curly-haired," from the Irish cas, but this is not settled.
Is Cassidy a popular name?
Yes. Cassidy ranked #541 in the US in 2025, which makes it in the top 1,000.
Is Cassidy a boy or girl name?
Cassidy is mainly a girl's name. About 95% of US babies named Cassidy over the last 20 years were girls, with a small share of boys.
How do you pronounce Cassidy?
Cassidy is usually pronounced KAS-ih-dee. Stressed syllables are in capital letters.
Popularity figures come from US Social Security card applications (names given to at least five babies in a year, 1880 to 2025). How we source names and meanings