Cailyn
How to say it: KAY-lin · /ˈkeɪlɪn/
Modern variant of Kaylyn/Caitlin; blends Gaelic cailín ('girl') with popular -lyn suffix.
Cailyn was the 334th most popular girls’ name in the United States in 2025, given to 40 babies (Social Security Administration). Its busiest decade was the 2000s, its births are down about 70% in ten years, and it is projected to slip to #493 by 2030.
Updated · SSA 2025 data, published May 2026 · Insee 2025 data, published July 2026 · How we compute these figures
Key facts
| Rank among girls’ names, 2025 | #334 |
|---|---|
| Babies born in 2025 | 40 |
| Share of births | 1 in 3,372 |
| Peak decade | 2000s |
| Change over 10 years | −70% |
| Projected rank for 2030 (estimate) | #493 |
| In France, 2025 | #1,126 among girls’ names, 0 births |
Sources: Social Security Administration (SSA), Insee (France). How we compute these figures.
Its life, decade by decade
Cailyn is a newcomer: almost all of its history is from the last forty years.
What goes with it
Nicknames
- Cai
- Cay
- Lynn
Honouring a Cailyn in the family
In the classroom
In a class of 25 children born in 2025, the chance that another child is called Cailyn is about 1 in 141.
Around the world
This spelling is used in English, Irish.
In France: #1,126 for girls in 2025.
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