Cassidy
Cassidy was given to 558 girls in 2025, #541 among girls’ names; 64,583 Americans have been recorded with it since 1968 (Social Security Administration, published May 2026).
An estimated 63,600 Americans named Cassidy and born in the U.S. are alive in 2026 (99% of everyone recorded); the median is 25 years old and half are between 17 and 30.
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Cassidy by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
What does Cassidy mean?
Wiktionary, English section
Cassidy is “a female given name transferred from the surname, of modern American usage.” Its etymology gives the senses “descendant of Caiside” (Caiside) and “curly-haired” (cas).
Also “a male given name transferred from the surname.”
From the Irish surname, Anglicized from Ó Caiside (“descendant of Caiside”), from cas (“curly-haired”).
/ˈkæsɪdi/
Meaning: Wiktionary, English section, as of Sep 25, 2026 (CC BY‑SA 4.0).
How popular is Cassidy?
#541 among girls’ names, 2025
Cassidy fell from #257 in 2015 to #541 in 2025 among girls’ names; its share of girls born fell from 0.69 to 0.35 per 1,000.
3,449 babies in 1999, the peak
Cassidy peaked in 1999, when 3,449 babies were given it (3,395 girls, #99 among girls’ names). The 609 births of 2025 (girls and boys) are 18% of that peak.
Births by sex.
| Year | Births | Rank | Per 1,000 girls |
|---|---|---|---|
| 2025 | 558 | #541 | 0.35 |
| 2024 | 646 | #478 | 0.40 |
| 2023 | 620 | #495 | 0.39 |
| 2022 | 661 | #478 | 0.40 |
| 2021 | 655 | #478 | 0.40 |
| 2020 | 765 | #411 | 0.47 |
| 2019 | 865 | #368 | 0.52 |
| 2018 | 869 | #361 | 0.51 |
| 2017 | 1,003 | #326 | 0.58 |
| 2016 | 1,123 | #289 | 0.63 |
Every recorded year (57)
| Year | Births | Rank | Per 1,000 girls |
|---|---|---|---|
| 2015 | 1,236 | #257 | 0.69 |
| 2014 | 1,311 | #247 | 0.73 |
| 2013 | 1,276 | #250 | 0.73 |
| 2012 | 1,140 | #280 | 0.65 |
| 2011 | 1,126 | #282 | 0.64 |
| 2010 | 1,286 | #251 | 0.72 |
| 2009 | 1,360 | #244 | 0.74 |
| 2008 | 1,491 | #228 | 0.79 |
| 2007 | 1,657 | #207 | 0.86 |
| 2006 | 1,771 | #199 | 0.93 |
| 2005 | 1,833 | #189 | 1.0 |
| 2004 | 2,007 | #168 | 1.1 |
| 2003 | 2,235 | #150 | 1.2 |
| 2002 | 2,634 | #131 | 1.5 |
| 2001 | 3,029 | #107 | 1.7 |
| 2000 | 3,163 | #107 | 1.7 |
| 1999 | 3,395 | #99 | 1.9 |
| 1998 | 3,045 | #113 | 1.7 |
| 1997 | 3,143 | #105 | 1.8 |
| 1996 | 2,844 | #109 | 1.6 |
| 1995 | 3,042 | #108 | 1.7 |
| 1994 | 2,306 | #139 | 1.3 |
| 1993 | 1,028 | #267 | 0.57 |
| 1992 | 725 | #355 | 0.39 |
| 1991 | 610 | #418 | 0.33 |
| 1990 | 521 | #470 | 0.27 |
| 1989 | 482 | #487 | 0.26 |
| 1988 | 405 | #538 | 0.23 |
| 1987 | 396 | #521 | 0.23 |
| 1986 | 371 | #546 | 0.22 |
| 1985 | 416 | #491 | 0.24 |
| 1984 | 406 | #492 | 0.24 |
| 1983 | 358 | #530 | 0.21 |
| 1982 | 219 | #756 | 0.13 |
| 1981 | 157 | #943 | 0.09 |
| 1980 | 131 | #1,077 | 0.08 |
| 1979 | 108 | #1,205 | 0.07 |
| 1978 | 102 | #1,222 | 0.07 |
| 1977 | 72 | #1,516 | 0.05 |
| 1976 | 62 | #1,602 | 0.04 |
| 1975 | 54 | #1,732 | 0.04 |
| 1974 | 36 | #2,219 | 0.02 |
| 1973 | 28 | #2,576 | 0.02 |
| 1972 | 32 | #2,313 | 0.02 |
| 1971 | 17 | #3,664 | 0.01 |
| 1970 | 12 | #4,528 | 0.01 |
| 1969 | 5 | #7,618 | under 0.01 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Cassidy a boy’s or a girl’s name?
Of the 64,583 Americans recorded as Cassidy, 94% are girls and 6% boys. In 2025 it went to 558 girls and 51 boys.
Years with fewer than 20 babies given the name are left blank.
Girls and boys named Cassidy: the SSA national file counts each sex separately.
How many people are named Cassidy, and how old are they?
63,600 alive in 2026, estimated
That is 99% of the 64,583 Americans ever recorded as Cassidy. The median Cassidy alive today is 25 years old; half are between 17 and 30.
The 2020 Census counted 55,593 people named Cassidy (52,712 women and girls, 2,881 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 59,851 born in the U.S. The Census count is 7% below that prediction.
Alive today, by age
Alive today, by generation
| Generation | Born | Alive |
|---|---|---|
| Generation X | 1965-1980 | 1,010 |
| Millennials | 1981-1996 | 15,700 |
| Generation Z | 1997-2012 | 34,700 |
| Generation Alpha | 2013-2025 | 12,200 |
An estimate, not a count. SSA’s files count people born in the United States who received a Social Security number, so anyone born abroad is not in them; before 1937 most people got a number as adults, and their survival is counted from that age.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Where are babies named Cassidy born?
The states with the most babies named Cassidy are California, Texas and Pennsylvania, with 32% of its births recorded by state in 2025.
| State | Births 2025 | Rank, girls | vs. national |
|---|---|---|---|
| California | 79 | #481 | 0.8× |
| Texas | 54 | #634 | 0.7× |
| Pennsylvania | 37 | #295 | 1.2× |
| New York | 29 | #568 | 0.8× |
| North Carolina | 24 | #455 | 1.0× |
| Michigan | 23 | #375 | 1.0× |
| New Jersey | 23 | #353 | 0.8× |
| Georgia | 21 | #533 | 0.9× |
| Ohio | 19 | #537 | 1.0× |
| Virginia | 19 | #416 | 1.0× |
Where Cassidy is more common than its national share predicts
Relative to its national share, Cassidy is most over-represented in Utah: since 1968 it was given 1.4 times as often there as its national share each year would predict.
States: SSA state file, 1910-2025, published May 8, 2026; births count girls and boys together, and the rank is among girls’ names in the state in 2025. The file leaves out any state and year with fewer than 5 babies of the name, so small states are undercounted; each ratio compares the state’s births of Cassidy with the births its national share predicts year by year, for states with at least 100 births of the name.
Names spelled alike
Of these 8 names spelled alike, given to 91,433 babies since 1880, Cassidy is the most given (71% of them). In 2025 it was given to 609 of their 882 babies (69%), again the most given.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Cassidy
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Cassidy and names like it
- Compare Cassidy and KassidyBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1990sCassidy peaked in 1999.
- California’s most given namesThe state where SSA recorded the most babies named Cassidy since 1910.
- From surnamesWiktionary’s origin for Cassidy: every such name, by how often it is given.
- The top names of 1999The year the most babies were named Cassidy.
- The names of Generation ZMost people named Cassidy alive today were born 1997-2012.
- Names starting with CMost given first.