Casidy
Below 5 births
Below 5 births
About Casidy
Casidy is a feminine name that represents a spelling variation of Cassidy, which originated as an Irish surname derived from the Gaelic 'Ó Caiside,' meaning 'descendant of Caiside.' The element 'caiside' possibly relates to 'cas,' meaning 'curly-headed' or 'vigilant.' This particular spelling with a single 's' emerged as parents sought to personalize the increasingly popular Cassidy, which gained traction as a given name for girls in the 1970s and 1980s. The popularity of the traditional Irish folk song 'Cassidy's Reel' and the association with the Grateful Dead song 'Cassidy' contributed to the name's appeal. Casidy offers a slightly streamlined look while maintaining the melodic sound and Irish heritage of the original.
Casidy for boys
Casidy as a masculine name represents a gender crossover from what was traditionally more common as a feminine name. It derives from the Irish surname Cassidy, which comes from the Gaelic "Ó Caiside" meaning "descendent of Caiside." The name has a modern, approachable quality while maintaining Irish heritage connections. Unlike the more common spelling Cassidy, this variant with a single 's' creates a subtle distinction. Though less frequently used for boys than girls, Casidy fits well with contemporary trends of surname-inspired first names and the increasing fluidity of gendered naming conventions. The name carries connotations of Irish culture and history while offering a friendly, accessible sound that works well in modern contexts.
Pronounced KAS-id-ee.
As of October 2026, Casidy ranked #13172 in US births in 2016 SSA, peaked at #4588 in 2001.
Popularity & trends
Data table
| Year | US rank | Births | Per million |
|---|---|---|---|
| 2014 | — | 0 | 0 |
| 2015 | — | 0 | 0 |
| 2016 | — | 0 | 0 |
| 2017 | — | 0 | 0 |
| 2018 | — | 0 | 0 |
| 2019 | — | 0 | 0 |
| 2020 | — | 0 | 0 |
| 2021 | — | 0 | 0 |
| 2022 | — | 0 | 0 |
| 2023 | — | 0 | 0 |
| 2024 | — | 0 | 0 |
| 2025 | — | 0 | 0 |