Cassidy is a familiar girls' name that peaked in 1999 and has since faded.
Cassidy is predominantly a girl name. In 2025 it ranked #541 among girls (558) and #2,575 among boys (51) — overall #998 across all names. The charts below show girls and boys separately.
| Year | U.S. births | U.S. + territories | ♀ Rank | ♂ Rank |
|---|---|---|---|---|
| 2025 | 609 | 609 | #541 | #2,575 |
| 2024 | 707 | 707 | #478 | #2,317 |
| 2023 | 675 | 675 | #495 | #2,445 |
| 2022 | 710 | 710 | #478 | #2,682 |
| 2021 | 698 | 698 | #478 | #2,871 |
| 2020 | 810 | 810 | #411 | #2,735 |
| 2019 | 920 | 920 | #368 | #2,430 |
| 2018 | 945 | 945 | #361 | #1,939 |
| 2017 | 1,073 | 1,073 | #326 | #2,020 |
| 2016 | 1,182 | 1,182 | #289 | #2,258 |
| 2015 | 1,278 | 1,278 | #257 | #2,817 |
| 2014 | 1,356 | 1,356 | #247 | #2,671 |
| 2013 | 1,331 | 1,331 | #250 | #2,306 |
| 2012 | 1,190 | 1,190 | #280 | #2,497 |
| 2011 | 1,176 | 1,176 | #282 | #2,481 |
| 2010 | 1,337 | 1,337 | #251 | #2,435 |
| 2009 | 1,415 | 1,415 | #244 | #2,354 |
| 2008 | 1,557 | 1,557 | #228 | #2,092 |
| 2007 | 1,710 | 1,710 | #207 | #2,418 |
| 2006 | 1,840 | 1,840 | #199 | #1,949 |
| 2005 | 1,873 | 1,873 | #189 | #2,713 |
| 2004 | 2,066 | 2,066 | #168 | #2,025 |
| 2003 | 2,259 | 2,259 | #150 | #3,641 |
| 2002 | 2,668 | 2,668 | #131 | #2,766 |
| 2001 | 3,068 | 3,068 | #107 | #2,494 |
| 2000 | 3,205 | 3,205 | #107 | #2,302 |
| 1999 | 3,449 | 3,449 | #99 | #1,826 |
| 1998 | 3,102 | 3,102 | #113 | #1,770 |
| 1997 | 3,198 | — | #105 | #1,756 |
| 1996 | 2,922 | — | #109 | #1,371 |
| 1995 | 3,129 | — | #108 | #1,246 |
| 1994 | 2,420 | — | #139 | #1,041 |
| 1993 | 1,137 | — | #267 | #1,061 |
| 1992 | 844 | — | #355 | #991 |
| 1991 | 712 | — | #418 | #1,077 |
| 1990 | 646 | — | #471 | #923 |
| 1989 | 606 | — | #487 | #911 |
| 1988 | 521 | — | #538 | #884 |
| 1987 | 516 | — | #521 | #852 |
| 1986 | 472 | — | #546 | #912 |
| 1985 | 567 | — | #491 | #719 |
| 1984 | 575 | — | #492 | #665 |
| 1983 | 521 | — | #530 | #669 |
| 1982 | 287 | — | #756 | #1,107 |
| 1981 | 217 | — | #943 | #1,188 |
| 1980 | 195 | — | #1,077 | #1,135 |
| 1979 | 149 | — | #1,205 | #1,466 |
| 1978 | 147 | — | #1,222 | #1,372 |
| 1977 | 125 | — | #1,516 | #1,211 |
| 1976 | 114 | — | #1,602 | #1,192 |
| 1975 | 86 | — | #1,732 | #1,596 |
| 1974 | 78 | — | #2,219 | #1,314 |
| 1973 | 53 | — | #2,576 | #1,786 |
| 1972 | 54 | — | #2,313 | #1,936 |
| 1971 | 43 | — | #3,666 | #1,749 |
| 1970 | 25 | — | #4,529 | #2,641 |
| 1969 | 10 | — | #7,620 | #4,485 |
| 1968 | 5 | — | — | #4,216 |