Cailin
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Meaning
a spelling of Kaylyn, an American blend of kay and lyn, that also matches the Irish word cailín, "girl"
How popular is Cailin around the world?
In the United States, 120 babies were named Cailin between 2020 and 2025. In Mexico City, there were 10 registrations of Cailin in 2022.
Cailin is on the official records of the United States, Mexico City, South Australia and Argentina.
United States
1 in 180,000
In the United States, 120 babies were named Cailin between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Cailin peaked in the 1990s and the 2010s in nearly equal measure.
Births with a Social Security record. Source: U.S. Social Security Administration
Mexico City City
1 in 12,000
In Mexico City, there were 10 registrations of Cailin in 2022.
share of that year’s registrations in the city
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
South Australia
1 in 18,0002017
In South Australia, 1 girl was registered as Cailin in 2017.
The count never rose above 4 in a year, too few to chart.
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
Argentina
1 in 95,000
In Argentina, 7 newborns were given the name Cailin in 2024.
share of that year’s name registrations
Given-name components of births in Argentina 2012–2024; national cells are lower bounds and no sex split is published. Source: RENAPER (Argentina), Dirección Nacional de Población, given names 2012-2024
Austria
last on record 2015
Cailin 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 1 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)
Canada
last on record 2015
Cailin is not on the 2024 record for Canada, where names under 5 in a year are excluded at source.
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
last on record 2020
Cailin is not on the 2025 record for England and Wales, where spellings under 3 in a year are withheld at source.
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
last on record 2017
Cailin is not on the 2025 record for Ireland, where names under 3 in a year are withheld at source.
The count never rose above 7 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. This registry counts each spelling separately; the figures above are for the exact spelling Cailin, and accented spellings are separate names. Source: Central Statistics Office (Ireland), Irish babies' names
Scotland
last on record 2015
Cailin is not on the 2024 record for Scotland, where spellings under 3 in total are suppressed at source.
The count never rose above 7 in a year, too few to chart.
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
Not on 8 other recordsWhy
- Not on the record in Spain, Puerto Rico, New Zealand 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 the Montevideo record for 1940 to 2011: that registry withholds nothing, so this spelling was not given there in those years.
- Not on the France record: nametree keeps spellings that reached 20 births 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 Cailin
Most people given the name Cailin 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.
The Cailin deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Cailin 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 Cailin fits with your family’s names and surname.
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