How Many People Are Named Caithlin?
An estimated 19 people in the United States have the first name Caithlin. It is almost exclusively a female name. The average bearer is 36 years old, and Caithlin peaked in popularity in 1988 with 7 births that year.
Below you will find a full statistical profile of Caithlin 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 Caithlin paired with any surname.
Key Insights
- Caithlin is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
19
About 1 in 18,039,702 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
36
years old
Peak Year
1988
7 births
Total Registered
20
since 1880
Gender Distribution for Caithlin
Caithlin is almost exclusively a female name. Out of 20 total births registered, 100.0% were female.
Caithlin as a female name
Ranked #12,003 in 1994
6 female births in 1994
Peak: 1988 (7 births)
Caithlin: Popularity Over Time
SSA records for Caithlin span from the 1980s to the 1990s, covering 2 decades of naming data. The most popular decade for this name was the 1990s, when 13 babies were registered. Caithlin remains highly popular today, with recent registration numbers near its historical peak.
Caithlin by Decade
How has Caithlin 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.
Caithlin + Last Name Combinations
How many people share a full name with Caithlin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Caithlin
Other first names starting with C with a similar number of bearers.
Caithlin: Questions and Answers
How many people in the U.S. are named Caithlin?
We estimate approximately 19 people named Caithlin 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 18,039,702 Americans share this first name.
Is Caithlin a common name?
Caithlin is classified as "Very Rare" and is more popular than 39.1% of all first names in the SSA database. A total of 20 births have been registered with this name since 1880.
When was Caithlin most popular?
Caithlin reached peak popularity in 1988, when 7 babies were given this name. The average age of a living person named Caithlin is approximately 36 years old, reflecting when the name was most commonly given.
Is Caithlin a female name?
Caithlin is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Caithlin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Caithlin Smith, Caithlin Johnson, Caithlin 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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