Cailyn
Girl name · #3736 in 2025 · Very rare
How old is the name Cailyn? In official American birth records, Cailyn has been tracked continuously since 1979, giving it 46 years of documented American history.
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. Source: Official national birth records.
Unlock the 5-year forecast and compare Cailyn against up to 5 other names.
Uniqueness: will there be another Cailyn in class?
On our rarity read — which blends how common Cailyn is today with its five-year momentum — the name reads as "very rare". 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 too sparse in 2025 to rank by rate — in most states its count falls below the SSA's per-state reporting threshold (counts under 5 are withheld).
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
How old is the name Cailyn?
In official American birth records, the name Cailyn first appeared in 1979 (over 46 years ago), when 5 newborn girls received the name. It has been tracked in modern national records for 46 years.
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. On our rarity scale (rarity blended with momentum) we classify it as "very rare".
Data source: Official American birth records, 1880–2025, national and state files. Counts reflect registered birth records for American families.