GirlIrish origin3 syllables
Cassidy
Meaning: “descendant of Caiside”
About the name Cassidy
Cassidy is a girl name with Irish roots, meaning “descendant of Caiside”.
In 2025, Cassidy ranked #541 for girls in the US, with 558 babies given the name. Its peak year since 1940 was 1999. Since 2000, 96% of US babies named Cassidy were girls.
Etymology
From Irish, meaning “descendant of Caiside”.
Name meaning adapted from Wiktionary (“Cassidy”) by Wiktionary contributors, CC BY-SA 4.0.
- US rank 2025
- #541
- In 2015
- #257
- Babies in 2025
- 558
Popularity of Cassidy, 1940–2025
Latest SSA data: 2025.
Popularity data: U.S. Social Security Administration national baby names (public domain; names given to at least 5 babies of one sex per year).
Names similar to Cassidy
Name meanings marked or linked “Wiktionary” are adapted from Wiktionary by Wiktionary contributors, CC BY-SA 4.0; each name page links its source entry.