How Many People Are Named Cailyn?
An estimated 5,426 people in the United States have the first name Cailyn. It is almost exclusively a female name. The average bearer is 19 years old, and Cailyn peaked in popularity in 2009 with 401 births that year.
Below you will find a full statistical profile of Cailyn as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Cailyn paired with any surname.
Estimated Living Americans
5,426
About 1 in 63,169 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
19
years old
Peak Year
2009
401 births
Total Registered
5,509
since 1880
Gender Distribution for Cailyn
Cailyn is almost exclusively a female name. Out of 5,509 total births registered, 100.0% were female.
Cailyn as a female name
Ranked #3,278 in 2024
48 female births in 2024
Peak: 2009 (401 births)
Cailyn: Popularity Over Time
SSA records for Cailyn span from the 1970s to the 2020s, covering 6 decades of naming data. The most popular decade for this name was the 2000s, when 2,445 babies were registered. Cailyn has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Cailyn by Decade
How has Cailyn tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Cailyn by State
Birth registrations for Cailyn span all 35 states and territories in the SSA database. The highest counts are in Texas, California, Florida. The lowest are in Nevada, Nebraska, Iowa. On average, about 107 Cailyns were registered per state.
Cailyn + Last Name Combinations
How many people share a full name with Cailyn as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cailyn
Other first names starting with C with a similar number of bearers.
Cailyn: Questions and Answers
How many people in the U.S. are named Cailyn?
We estimate approximately 5,426 people named Cailyn are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 63,169 Americans share this first name.
Is Cailyn a common name?
Cailyn is classified as "Rare" and is more popular than 96.7% of all first names in the SSA database. A total of 5,509 births have been registered with this name since 1880.
When was Cailyn most popular?
Cailyn reached peak popularity in 2009, when 401 babies were given this name. The average age of a living person named Cailyn is approximately 19 years old, reflecting when the name was most commonly given.
Is Cailyn a female name?
Cailyn is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Cailyn Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cailyn Smith, Cailyn Johnson, Cailyn Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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