Cai
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Meaning
the Welsh form of Kay
How popular is Cai around the world?
In the United States, 639 babies were named Cai between 2020 and 2025. In England and Wales, 52 boys named Cai were born in 2025, the 687th most common name among boys that year.
Cai is on the official records of the United States, England and Wales, Argentina, Canada, Austria and Spain.
United States
1 in 34,000
In the United States, 639 babies were named Cai between 2020 and 2025.
Shape drawn from US Social Security baby-name records. Cai peaked in the 2010s and the 2020s in nearly equal measure.
Births with a Social Security record. Source: U.S. Social Security Administration
England and Wales
1 in 11,000
In England and Wales, 52 boys named Cai were born in 2025, the 687th most common name among boys 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
Argentina
1 in 20,000
In Argentina, 33 newborns were given the name Cai 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
Canada
1 in 61,000
In Canada, 6 boys named Cai were born in 2024, ranked 2,855th among boys 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)
Austria
1 in 76,000
In Austria, 1 boy named Cai was born in 2025, ranked 1,842nd among boys that year, spellings that differ only by special characters counted together.
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)
Spain
1 in 310,000
In Spain, 144 residents are named Cai, ranked 6,121st among men, with a mean age of 14.6 years.
Residents of Spain on 1 January 2025. Spain publishes how old a name’s living bearers are, not a birth series, so there is no year chart. Source: INE (Spain), Censo de Población anual, 1 January 2025
Ireland
last on record 2023
Cai is not on the 2025 record for Ireland, where names under 3 in a year are withheld at source.
The count never rose above 4 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
Scotland
last on record 2022
Cai is not on the 2024 record for Scotland, where spellings under 3 in total are suppressed at source.
The count never rose above 6 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
South Australia
last on record 2011
Cai is not on the 2017 record for South Australia, whose registry publishes every name given that year.
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
Not on the record in Mexico City, 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 Cai
Most people given the name Cai in the United States are children or teenagers today. The name belongs to this generation.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
Keep exploring
The Cai deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Cai 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 Cai fits with your family’s names and surname.
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