ChatGPT
Claude
Gemini
Perplexity
The short answer
Cassidy is a feminine name used in English. Behind the Name describes it this way: "From an Irish surname (Anglicized from Irish Gaelic Ó Caiside), which is derived from the byname Caiside. Very rare as a given name before the 1970s, it established itself in the 80s and then surged in popularity during the 90s." It ranked #541 for girls in the United States in 2025.
Meaning and etymology
According to Behind the Name, from an Irish surname (Anglicized from Irish Gaelic Ó Caiside), which is derived from the byname Caiside. Very rare as a given name before the 1970s, it established itself in the 80s and then surged in popularity during the 90s. The entry lists its usage as English (Modern).
Editorial confidence: likely
Popularity
Cassidy ranked #541 for girls in the United States in 2025. The figure comes from the Social Security Administration's national file for that year.
| Region | Year | Rank | Source |
|---|---|---|---|
| United States | 2025 | #541 | ssa-2025 |
If you like this name
Names that Behind the Name files under the same origin (English) and that sit near Cassidy in the 2025 American rankings.
Similar by origin
Frequently asked questions
What does the name Cassidy mean?
Behind the Name does not give Cassidy a one-word meaning. It describes the name as follows: from an Irish surname.
Is Cassidy a popular name?
Cassidy ranked #541 for girls in the United States in 2025. (Social Security Administration data).
Is Cassidy a boy's or a girl's name?
In the 2025 SSA data Cassidy appears in the girls' list; Behind the Name labels it feminine & masculine.
Sources
- Behind the Name: Meaning, origin and history of the name Cassidy — supports meaning, usage, pronunciation, variants.
- U.S. Social Security Administration: Popular Baby Names — national data, year of birth 2025 — supports popularity.
