Feminine dossier · first seen 1979

Cailyn

Endangered Down 90% from peak

Peak era

2009

Peak births

401

Current vitality

Rare

Peak generation

Gen Z

Quick answers about Cailyn

How many people are named Cailyn?

An estimated 5,468 living Americans are named Cailyn.

How rare is Cailyn?

Cailyn is very rare among babies today, with 40 girls receiving the name in 2025, down 90% from its 2009 peak.

How old is the typical Cailyn?

The median age of a living American named Cailyn is approximately 18 years, with most bearers falling between 14 and 24 years old.

Is Cailyn still popular?

No. Cailyn is endangered as a baby name, down 90% from its 2009 peak with 40 births in 2025.

Where is Cailyn most common?

Cailyn has its strongest geographic signal in Alabama, where it appears 2.1× more often than the national baseline.

1979Peak 20092025

Peak year

2009

Decline from peak

90%

2025

All-time

5,549

Cailyn has been in gradual retreat. The last decade averaged 4.2× lower than the decade before it — a slow, steady fade rather than a collapse.

Cailyn peaked in 2009, when 401 girls were given the name.

In 2025, only 40 girls were given the name.

Down 90% from its peak.

In all, the Social Security Administration has recorded about 5,549 Americans named Cailyn since 1979.

Rarity score99th percentile rare

Peak generationGen Z

StabilityHighly era-bound

TrajectoryDown 90% from peak

Living profile

5,490

Estimated living Americans with this name.

Median age18

Core range14–24

Playground Density Index 0.1%

Wave type

Flash Flood

A concentrated generational spike rather than a slow classic.

Geographic heartland

Alabama

2.1× higher affinity than the national baseline.

Alabama · 2000s 2.1×

Massachusetts · 2000s 2.0×

Georgia · 2010s 1.8×