Casidy: Name Popularity, History & Rankings (1880

By decade. Change compares yearly averages, so the current partial decade is on equal footing. Best rank is the name's best yearly rank within the decade.

Decade	Girls	Per year	Change	Best rank
1880s	–	–	–	–
1890s	–	–	–	–
1900s	–	–	–	–
1910s	–	–	–	–
1920s	–	–	–	–
1930s	–	–	–	–
1940s	–	–	–	–
1950s	–	–	–	–
1960s	–	–	–	–
1970s	–	–	–	–
1980s	34	3	–	#8,660
1990s	116	12	+241%	#4,859
2000s	145	15	+25%	#4,588
2010s	52	5	-64%	#9,350
2020s (to 2025)	–	–	–	–

Decade

Girls

Per year

Change

Best rank

1880s

–

1890s

–

1900s

–

1910s

–

1920s

–

1930s

–

1940s

–

1950s

–

1960s

–

1970s

–

1980s

–

#8,660

1990s

116

+241%

#4,859

2000s

145

+25%

#4,588

2010s

-64%

#9,350

2020s (to 2025)

–

The story of Casidy

Casidy is not currently in use for newborns in the United States: fewer than five babies received the name in 2025. Its story lives in the historical record below.

Since 1980, 347 American babies have been named Casidy. Its peak came in 2001, when 26 newborns received the name, the signature sound of the 2000s.

The chart above shows the full history: the popularity view (births per 1,000 babies) is the honest comparison across generations, since total US births have changed enormously since 1880. Switch to the rank view to see where Casidy stood among all girls' names in any year, or use the compare tool to plot it against other names.

How old are people named Casidy?

The median living Casidy is about 24 years old; half are between 19 and 29. An estimated 300 people named Casidy are alive in the United States today.

Estimated from births per year and Social Security period life tables; an approximation of the living age distribution, by age in years.

Casidy year by year

Every year since 2001, and five-year steps back to 1880. Rank is within each sex.

Year	Girls	Girls rank
2025	–	–
2024	–	–
2023	–	–
2022	–	–
2021	–	–
2020	–	–
2019	–	–
2018	–	–
2017	–	–
2016	7	#13,177
2015	–	–
2014	5	#17,081
2013	8	#12,217
2012	10	#10,596
2011	10	#10,552
2010	12	#9,350
2009	5	#17,831
2008	12	#9,600
2007	7	#14,216
2006	11	#10,046
2005	16	#7,212
2004	12	#8,827
2003	14	#7,667
2002	22	#5,290
2001	26	#4,588
2000	20	#5,529
1995	15	#6,016
1990	8	#9,390
1985	6	#9,460
1980	5	#10,602
1975	–	–
1970	–	–
1965	–	–
1960	–	–
1955	–	–
1950	–	–
1945	–	–
1940	–	–
1935	–	–
1930	–	–
1925	–	–
1920	–	–
1915	–	–
1910	–	–
1905	–	–
1900	–	–
1895	–	–
1890	–	–
1885	–	–
1880	–	–

Frequently asked questions

Quick answers about Casidy, drawn from the same Social Security data as the charts above.

How old is the average Casidy?

The median living Casidy is about 24 years old. Half of all living Casidys are between 19 and 29 years old.

How many people named Casidy are alive today?

An estimated 300 people named Casidy are alive in the United States, based on 347 recorded births and Social Security life tables.

What does the name Casidy mean?

Spelling variant of Cassidy.

How popular is the name Casidy in 2025?

Casidy did not appear in the 2025 Social Security data, which means fewer than five babies received the name that year.

How many people are named Casidy?

347 babies have been named Casidy in the United States since 1980, based on Social Security card applications.

When was the name Casidy most popular?

Casidy peaked in 2001, when 26 newborns received the name.

Is Casidy a boy or girl name?

Casidy is overwhelmingly a girl's name: 100% of babies with the name.

Is the name Casidy rising or falling?

Casidy is declining, less popular now than a decade ago.

Casidy

Casidy popularity over time

The story of Casidy

How old are people named Casidy?

Casidy year by year

Frequently asked questions

Names like Casidy