Cailyn
Girl name · #3736 in 2025 · Uniqueness 88/100
In 2025, 40 baby girls were named Cailyn, placing it at #3736 in the official national rankings. A decade ago it stood at #1337, so the name has been falling over the past ten years. Roughly one in every 45,000 girls born in 2025 was named Cailyn.
The 46-year story
Cailyn first appears in the Social Security records in 1979, when 5 girls received the name. Its peak came in 2009, when 401 girls were named Cailyn — good for #724 that year. Today's parents encounter it on its way down the popularity curve, which for many parents is exactly the appeal. Following the curve matters more than today's snapshot: a name's position on its rise-peak-decline arc is the best predictor of how common it will feel in a kindergarten class five years from now.
Babies named Cailyn per year, 1880–2025. Source: SSA.
Unlock the 5-year forecast and compare Cailyn against up to 5 other names.
Uniqueness: will there be another Cailyn in class?
Cailyn scores 88 out of 100 on our uniqueness scale, which blends current rarity with five-year momentum — putting it in the "rare" band. A high score means genuine rarity — your Cailyn will likely be the only one in the room, with the occasional spelling-out as the price.
Where Cailyn is most common
State-level data for Cailyn is sparse in 2025 — the name's footprint is too small for most states to report (the SSA suppresses counts under 5 per state for privacy).
Names like Cailyn
Statistically, parents drawn to Cailyn tend to be choosing among names with similar popularity arcs, era profiles, and sounds — the closest matches in our model are Jaylyn, Jadelyn, Joslyn, Jaelyn, and Kaelyn.
JaylynJadelynJoslynJaelynKaelynKailynJailynArlyn
Rank history (last 25 years)
| Year | Babies named Cailyn | Rank |
|---|---|---|
| 2025 | 40 | #3712 |
| 2024 | 48 | #3277 |
| 2023 | 53 | #3091 |
| 2022 | 65 | #2661 |
| 2021 | 55 | #3002 |
| 2020 | 70 | #2468 |
| 2019 | 70 | #2508 |
| 2018 | 67 | #2584 |
| 2017 | 87 | #2184 |
| 2016 | 114 | #1815 |
| 2015 | 177 | #1337 |
| 2014 | 178 | #1326 |
| 2013 | 219 | #1111 |
| 2012 | 256 | #985 |
| 2011 | 301 | #868 |
| 2010 | 322 | #835 |
| 2009 | 401 | #724 |
| 2008 | 399 | #742 |
| 2007 | 276 | #974 |
| 2006 | 306 | #869 |
| 2005 | 209 | #1125 |
| 2004 | 206 | #1107 |
| 2003 | 186 | #1160 |
| 2002 | 172 | #1189 |
| 2001 | 127 | #1476 |
Frequently asked questions
Is Cailyn a popular girl name?
Cailyn ranked #3736 among girls in 2025 with 40 babies given the name — outside the top 500, making it an uncommon pick. Ten years earlier it ranked #1337.
When was the name Cailyn most popular?
Cailyn peaked in 2009, when 401 American girls received the name (ranked #724 that year). Since 2009 the name has declined from that high.
How rare is the name Cailyn?
In 2025, roughly 1 in 45,000 newborn American girls was named Cailyn. It scores 88/100 on our uniqueness scale (rarity blended with momentum), which we classify as "rare".
Data source: U.S. Social Security Administration name statistics, 1880–2025, national and state files. Counts reflect Social Security card applications; names with fewer than 5 occurrences in a state-year are suppressed by the SSA.