Girls' name · peaked in 1999
Cassidy name popularity since 1925
64,583 babies born in the US from 1925 to 2025 were named Cassidy (94.2% girls, 5.8% boys). Half of them were born in 2001 or earlier, so the typical Cassidy is about 25 years old in 2026. Cassidy peaked in 1999 as the #99 name for girls, and it ranked #541 in 2025.
Key facts
- US babies since 1925
- 64,583
- Named Cassidy, 1925–2025
- In 2025
- #541
- for girls in 2025 (558 babies)
- Girls / boys
- 94.2% girls
- 60,848 girls · 3,735 boys
- Most popular in
- Utah
- 2.36× its national share
Peak year is the year Cassidy made up the largest share of US girls, in records going back to 1880. Typical age is based on births from 1925 on, not on who is living today.
Cassidy births per year, 1925–2025
1999 was the biggest year for Cassidy both by count and as a share of all babies.
- Fastest rise: Between 1990 and 1995, Cassidy became 6.3× more common, from 1 in 3,640 baby girls to 1 in 578.
- Steepest fall: Between 2001 and 2006, its share of baby girls fell by 45%, from 1 in 594 to 1 in 1,070.
Shaded on the chart. Both compare Cassidy's share of all US girls five years apart, counting only years with at least 100 babies named Cassidy.
Decade by decade
Babies named Cassidy in each decade, and its rank among girls' names in the middle year of the decade (1935, 1945 … 2025).
| Decade | Girls | Boys | Rank |
|---|---|---|---|
| 1925–29 | 0 | 0 | – |
| 1930s | 0 | 0 | Under 5 |
| 1940s | 0 | 0 | Under 5 |
| 1950s | 0 | 0 | Under 5 |
| 1960s | 5 | 10 | Under 5 |
| 1970s | 523 | 351 | #1,732 |
| 1980s | 3,341 | 1,136 | #491 |
| 1990s | 20,659 | 900 | #108 |
| 2000s | 21,180 | 481 | #189 |
| 2010s | 11,235 | 553 | #257 |
| 2020–25 | 3,905 | 304 | #541 |
Ranks count every name given to at least 5 girls that year, so they can go past 1,000. "Under 5" means fewer than 5 girls got the name.
Generation fingerprint
54.4% of babies named Cassidy from 1925 to 2025 were born in the Gen Z years (1997–2012). The full split by generation:
Where Cassidy is most popular
The index compares Cassidy's share of babies in each state with its share nationwide, 1925–2025 (1.50× = 50% more common). States with at least 300 babies named Cassidy.
| State | Index | Babies |
|---|---|---|
| Utah | 2.36× | 1,231 |
| Nevada | 2.00× | 438 |
| Colorado | 1.75× | 1,324 |
| Idaho | 1.55× | 378 |
| Maine | 1.52× | 397 |
Other spellings
Spellings that sound like Cassidy and were given to at least 1,000 girls from 1925 to 2025, with the year each one was most popular.
| Spelling | Girls | Peak year |
|---|---|---|
| Cassidy (this page) | 60,848 | 1999 |
| Kassidy | 21,282 | 2000 |
| Cassady | 1,085 | 1999 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Cassidy's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Cassidy.
Names from the same era
Other common names that peaked within two years of Cassidy (1999).
Source: U.S. Social Security Administration national and state baby-name data, which covers names given to at least 5 babies of one sex in a year. About the data