Cassidy
Irish surname Ó Caiside, from a byname meaning “curly-haired.”
Popularity, 1880–2025
Cassidy first shows up in the national records in 1968. It has ranked among the top 100 names for American girls in 1 different years between 1999 and 1999. Its biggest year was 1999, when 3,395 newborn girls received the name, ranking it No. 99 nationally. In 2025 it ranked No. 541 for girls. The name has also seen real use for boys: 3,735 of the 64,583 Americans given the name since 1880.
Related names
Other spellings on record: Kassidy (21,715), Kassidi (1,241), Cassady (1,172), Cassidi (863), Cassidee (783), Kassidee (657) (total births since 1880)
Explore Cassidy interactively →By the decade
| Decade | Births | Best rank |
|---|---|---|
| 1960s | 5 | No. 7471 |
| 1970s | 523 | No. 1204 |
| 1980s | 3,341 | No. 487 |
| 1990s | 20,659 | No. 99 |
| 2000s | 21,180 | No. 107 |
| 2010s | 11,235 | No. 247 |
| 2020s | 3,905 | No. 411 |
Births and rank shown for girls, the sex more often given the name. The Social Security Administration omits name–year combinations with fewer than five births.
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Data: U.S. Social Security Administration national baby-name file, 1880–2025.