Cassidy
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The story
Cassidy is the Irish surname Ó Caiside worn as a given name, built on cas, twisted, curly, so the oldest meaning is simply curly-haired. America heard it as music first: it arrived in numbers in the 1970s, the Partridge Family years, when David Cassidy was the poster on every wall, about 870 that decade from nearly none before. The climb never paused: 4,500 in the 1980s, 21,600 in the 1990s, cresting at 21,700 in the 2000s, a two-decade run at the top before the drift to 11,800 in the 2010s and 4,210 so far. It goes overwhelmingly to girls, about 60,800 to 3,700. Cassie comes built in, the same hand-me-down Cassandra offers, and Casey, at about 194,800, keeps the family's C-sound in circulation. Curly-haired in Gaelic, straight-A American since the seventies: Cassidy wears both.
How popular is Cassidy around the world?
In the United States, 4,209 babies were named Cassidy between 2020 and 2025. In South Australia, 8 girls were registered as Cassidy in 2017.
Cassidy is on the official records of the United States, South Australia, New Zealand, Scotland, Canada, England and Wales, Ireland and France.
United States
1 in 5,200
In the United States, 4,209 babies were named Cassidy between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Cassidy peaked in the 2000s. Cassidy went to 1,278 US babies in 2015 and 609 in 2025, 48% of the earlier figure.
Births with a Social Security record. Source: U.S. Social Security Administration
South Australia
1 in 2,0002017
In South Australia, 8 girls were registered as Cassidy in 2017.
share of that year’s name registrations
Births registered in South Australia (not all of Australia) by first name and year of registration, 1944–2017, from the state’s Births, Deaths and Marriages registry, which publishes every name down to a single birth in capitals; a spelling its export repeats inside a year is counted once, and from 2018 only a top 100 is published, so the series ends at 2017. Source: Consumer and Business Services (South Australia), popular baby names
New Zealand
1 in 5,200
In New Zealand, 11 girls named Cassidy were registered in 2025.
share of that year’s name registrations
First given names from New Zealand birth registrations, grouped by registration year; any name under 10 in a year is excluded at source. Shares divide by Stats NZ’s count of births registered to mothers living in New Zealand, under 1% below the registry’s own count. Source: Department of Internal Affairs (New Zealand), baby name popularity over time
Scotland
1 in 5,700
In Scotland, 8 girls named Cassidy were registered in 2024, the 384th most common name among girls that year.
share of that year’s name registrations
Births registered in Scotland; different spellings count separately but accents are merged at source, and any spelling under 3 in total is suppressed. Source: National Records of Scotland, babies' first names
Canada
1 in 9,400
In Canada, 39 girls named Cassidy were born in 2024, the 746th most common name among girls that year.
share of that year’s name registrations
First given names from provincial and territorial vital statistics across Canada; any name-sex-year under 5 is excluded at source, and small Quebec counts carry a randomized adjustment made at source. Shares divide by Statistics Canada’s count of live births for the year; the 2024 count is preliminary. Source: Statistics Canada, first names at birth (table 17-10-0147-01)
England and Wales
1 in 12,000
In England and Wales, 45 girls named Cassidy were born in 2025, the 807th most common name among girls that year.
share of that year’s name registrations
Birth registrations in England and Wales (not the whole UK); exact spellings are counted separately, and any spelling under 3 in a year is withheld at source. Source: Office for National Statistics, baby names in England and Wales
Ireland
1 in 14,000
In Ireland, 4 girls named Cassidy were born in 2025, the 718th most common name among girls that year.
The count never rose above 5 in a year, too few to chart.
Exact registered spellings from Irish vital statistics; any name under 3 in a year is withheld at source, and accented spellings (fadas) are recorded reliably only from 2018. Source: Central Statistics Office (Ireland), Irish babies' names
France
1 in 32,000
In France, about 20 girls named Cassidy were born in 2025, ranked 1,733rd among girls that year.
share of that year’s births on record
Births in France by year of birth, from INSEE’s fichier des prénoms (1900–2025; Mayotte from 2012); exact spellings count separately (Léo and Leo are different names), any spelling under 3 in a year and sex is withheld at source, every count is rounded to the nearest 5 at source, and nametree keeps the spellings that reached 20 in some year. Shares divide by INSEE’s count of births in France from 1957, and before that by the file’s own total for the year; INSEE says the file is not complete before 1946. Source: Insee, fichier des prénoms (last updated 2026-07-16)
Austria
last on record 2024
Cassidy is not on the 2025 record for Austria, which publishes every first name down to a single birth, so the name was not given there that year.
The count never rose above 3 in a year, too few to chart.
Live births in Austria by year of birth, 1984–2025, from Statistik Austria’s first-name statistics; spellings that differ only by special characters are counted together (umlauts stay apart), every name down to a single birth is published, and the count covers babies with Austrian citizenship only until 2009, every baby from 2010, and from 2015 also births abroad to mothers living in Austria. Shares divide by Statistik Austria’s count of live births from 2010, and before that by the file’s own total for the year. Source: Statistik Austria - data.statistik.gv.at (OGDEXT_VORNAMEN_1, updated 2026-07-09)
Mexico City City
last on record 2016
Cassidy is not on the 2022 record for Mexico City, where small counts are withheld at source.
The count never rose above 4 in a year, too few to chart.
Civil-registry acts in Mexico City by registration year. Counts are lower bounds (names under 6 in a month and borough are removed at source) and count name-instances, not people; compound names are split, so “Maria Jose” counts under each part. 2023, a partial extract through 3 Mar with no cell on record for this name, is excluded. Source: Registro Civil of Mexico City, open data portal, registered given names 2000-2023
Montevideo City
last on record 1998
Cassidy is not on the 2011 record for Montevideo, whose registry withholds nothing, so the spelling was not given there that year.
The count never rose above 2 in a year, too few to chart.
Births in the department of Montevideo (not all of Uruguay) by first name and year of birth, 1940–2011, from the city’s civil registry, which writes names in capitals, almost always without accents; counted as spelling groups (accent and punctuation variants merged), nothing is withheld at source, and 2012 is excluded as a partial year. Source: Servicio de Registro Civil, Intendencia de Montevideo, Partidas de Registro Civil de Montevideo (Licencia de Datos Abiertos - Uruguay); 2012 dropped as partial
Not on the record in Spain, Argentina, Puerto Rico and Poland: those registries withhold small counts, so rare uses may sit below their floors.
Not on the Chile record: nametree keeps spellings that reached 5 registrations in some year, so rarer uses are not shown. Not on Norway’s list: Statistics Norway lists only first names carried by 200 or more living people, so rarer names are not shown.
When you meet Cassidy
Most people given the name Cassidy in the United States are teenagers or young adults today.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
Keep exploring
Names like Cassidy · Names that go with Cassidy · Nicknames for Cassidy · Climbers and fallers
The Cassidy deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Cassidy truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Cassidy fits with your family’s names and surname.
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