How Many People Are Named Cailin?
An estimated 3,645 people in the United States have the first name Cailin. It is predominantly female (99.2%). The average bearer is 25 years old, and Cailin peaked in popularity in 1998 with 169 births that year.
Below you will find a full statistical profile of Cailin 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 Cailin paired with any surname.
Estimated Living Americans
3,645
About 1 in 94,034 people in the U.S.
Rarity
Rare
Predicted Gender
Female
99.2% confidence
Average Age
25
years old
Peak Year
1998
169 births
Total Registered
3,736
since 1880
Gender Distribution for Cailin
Cailin is almost exclusively a female name. Out of 3,736 total births registered, 99.2% were female.
Cailin as a male name
Ranked #12,763 in 2009
5 male births in 2009
Peak: 1998 (7 births)
Cailin as a female name
Ranked #7,637 in 2024
14 female births in 2024
Peak: 2003 (164 births)
Cailin: Popularity Over Time
SSA records for Cailin span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2000s, when 1,442 babies were registered. Cailin has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Cailin by Decade
How has Cailin 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.
Cailin by State
Birth registrations for Cailin span all 26 states and territories in the SSA database. The highest counts are in California, New York, Pennsylvania. The lowest are in Nevada, Missouri, Colorado. On average, about 72 Cailins were registered per state.
Cailin + Last Name Combinations
How many people share a full name with Cailin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cailin
Other first names starting with C with a similar number of bearers.
Cailin: Questions and Answers
How many people in the U.S. are named Cailin?
We estimate approximately 3,645 people named Cailin 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 94,034 Americans share this first name.
Is Cailin a common name?
Cailin is classified as "Rare" and is more popular than 95.7% of all first names in the SSA database. A total of 3,736 births have been registered with this name since 1880.
When was Cailin most popular?
Cailin reached peak popularity in 1998, when 169 babies were given this name. The average age of a living person named Cailin is approximately 25 years old, reflecting when the name was most commonly given.
Is Cailin a female name?
Cailin is predominantly female. 99.2% of people with this name are female. See the gender breakdown above for full details.
How many Cailin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cailin Smith, Cailin Johnson, Cailin 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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