Cailyn
Cailyn is given to both girls and boys: 40 girls and 5 boys were given it in 2025 (#3,727 among girls’ names and #12,343 among boys’, #6,014 among all names counting both); 5,554 Americans have been recorded with it since 1979 (Social Security Administration, published May 2026).
An estimated 5,500 Americans named Cailyn and born in the U.S. are alive in 2026 (99% of everyone recorded); the median is 18 years old and half are between 14 and 24.
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Cailyn by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Cailyn?
#3,727 among girls’ names, 2025
Cailyn fell from #1,339 in 2015 to #3,727 in 2025 among girls’ names; its share of girls born fell from 99.2 to 24.9 per million.
401 babies in 2009, the peak
Cailyn peaked in 2009, when 401 girls were given it, #725 among girls’ names. The 45 births of 2025 (girls and boys) are 11% of that peak.
| Year | Births | Rank | Per 1,000 girls |
|---|---|---|---|
| 2025 | 40 | #3,727 | 0.02 |
| 2024 | 48 | #3,293 | 0.03 |
| 2023 | 53 | #3,105 | 0.03 |
| 2022 | 65 | #2,666 | 0.04 |
| 2021 | 55 | #3,011 | 0.03 |
| 2020 | 70 | #2,474 | 0.04 |
| 2019 | 70 | #2,513 | 0.04 |
| 2018 | 67 | #2,588 | 0.04 |
| 2017 | 87 | #2,186 | 0.05 |
| 2016 | 114 | #1,818 | 0.06 |
Every recorded year (45)
| Year | Births | Rank | Per 1,000 girls |
|---|---|---|---|
| 2015 | 177 | #1,339 | 0.10 |
| 2014 | 178 | #1,328 | 0.10 |
| 2013 | 219 | #1,112 | 0.12 |
| 2012 | 256 | #985 | 0.15 |
| 2011 | 301 | #869 | 0.17 |
| 2010 | 322 | #836 | 0.18 |
| 2009 | 401 | #725 | 0.22 |
| 2008 | 399 | #742 | 0.21 |
| 2007 | 276 | #974 | 0.14 |
| 2006 | 306 | #870 | 0.16 |
| 2005 | 209 | #1,125 | 0.11 |
| 2004 | 206 | #1,106 | 0.11 |
| 2003 | 186 | #1,160 | 0.10 |
| 2002 | 172 | #1,188 | 0.10 |
| 2001 | 127 | #1,476 | 0.07 |
| 2000 | 163 | #1,217 | 0.09 |
| 1999 | 151 | #1,243 | 0.09 |
| 1998 | 157 | #1,183 | 0.09 |
| 1997 | 129 | #1,334 | 0.07 |
| 1996 | 94 | #1,624 | 0.05 |
| 1995 | 88 | #1,670 | 0.05 |
| 1994 | 77 | #1,836 | 0.04 |
| 1993 | 53 | #2,380 | 0.03 |
| 1992 | 41 | #2,871 | 0.02 |
| 1991 | 23 | #4,350 | 0.01 |
| 1990 | 44 | #2,644 | 0.02 |
| 1989 | 25 | #3,902 | 0.01 |
| 1988 | 27 | #3,488 | 0.02 |
| 1987 | 13 | #5,635 | 0.01 |
| 1986 | 11 | #6,213 | 0.01 |
| 1985 | 18 | #4,297 | 0.01 |
| 1984 | 11 | #5,943 | 0.01 |
| 1983 | 8 | #7,396 | under 0.01 |
| 1982 | 7 | #8,334 | under 0.01 |
| 1979 | 5 | #10,393 | under 0.01 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Cailyn a boy’s or a girl’s name?
Cailyn has been given almost only to girls: 5 boys in 45 years of records.
Girls and boys named Cailyn: the SSA national file counts each sex separately.
How many people are named Cailyn, and how old are they?
5,500 alive in 2026, estimated
That is 99% of the 5,554 Americans ever recorded as Cailyn. The median Cailyn alive today is 18 years old; half are between 14 and 24.
The 2020 Census counted 4,718 people named Cailyn (4,689 women and girls, 29 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 5,190 born in the U.S. The Census count is 9% below that prediction.
Alive today, by age
Alive today, by generation
| Generation | Born | Alive |
|---|---|---|
| Generation X | 1965-1980 | 5 |
| Millennials | 1981-1996 | 528 |
| Generation Z | 1997-2012 | 3,720 |
| Generation Alpha | 2013-2025 | 1,240 |
An estimate, not a count. SSA’s files count people born in the United States who received a Social Security number, so anyone born abroad is not in them; before 1937 most people got a number as adults, and their survival is counted from that age.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Where are babies named Cailyn born?
| State | Births 2025 | Rank, girls | vs. national |
|---|---|---|---|
| Texas | 5 | #3,382 | 0.8× |
| Georgia | 5 | #1,572 | 1.1× |
Where Cailyn is more common than its national share predicts
Relative to its national share, Cailyn is most over-represented in Georgia: since 1979 it was given 1.1 times as often there as its national share each year would predict.
States: SSA state file, 1910-2025, published May 8, 2026; births count girls and boys together, and the rank is among girls’ names in the state in 2025. The file leaves out any state and year with fewer than 5 babies of the name, so small states are undercounted; each ratio compares the state’s births of Cailyn with the births its national share predicts year by year, for states with at least 100 births of the name.
Names spelled alike
Of these 8 names spelled alike, given to 66,485 babies since 1880, Cailyn is the fifth most given (8.4% of them). In 2025 it was given to 45 of their 476 babies (9.5%), again the fifth most given.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Cailyn
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Cailyn and names like it
- Compare Cailyn and KaelynBirths, ranks, peak and the living estimate side by side.
- The most given names of the 2000sCailyn peaked in 2009.
- Texas’s most given namesThe state where SSA recorded the most babies named Cailyn since 1910.
- The top names of 2009The year the most babies were named Cailyn.
- The names of Generation ZMost people named Cailyn alive today were born 1997-2012.
- Names starting with CMost given first.