How Many People Are Named Kaithlyn?
An estimated 376 people in the United States have the first name Kaithlyn. It is almost exclusively a female name. The average bearer is 20 years old, and Kaithlyn peaked in popularity in 2002 with 21 births that year.
Below you will find a full statistical profile of Kaithlyn 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 Kaithlyn paired with any surname.
Estimated Living Americans
376
About 1 in 911,581 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
20
years old
Peak Year
2002
21 births
Total Registered
383
since 1880
Gender Distribution for Kaithlyn
Kaithlyn is almost exclusively a female name. Out of 383 total births registered, 100.0% were female.
Kaithlyn as a female name
Ranked #12,718 in 2024
7 female births in 2024
Peak: 2002 (21 births)
Kaithlyn: Popularity Over Time
SSA records for Kaithlyn span from the 1980s to the 2020s, covering 5 decades of naming data. The most popular decade for this name was the 2000s, when 170 babies were registered. Kaithlyn has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Kaithlyn by Decade
How has Kaithlyn 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.
Kaithlyn by State
Birth registrations for Kaithlyn span all 3 states and territories in the SSA database. The highest counts are in California, New York, Texas. The lowest are in Texas, New York, California. On average, about 17 Kaithlyns were registered per state.
Kaithlyn + Last Name Combinations
How many people share a full name with Kaithlyn as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kaithlyn
Other first names starting with K with a similar number of bearers.
Kaithlyn: Questions and Answers
How many people in the U.S. are named Kaithlyn?
We estimate approximately 376 people named Kaithlyn 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 911,581 Americans share this first name.
Is Kaithlyn a common name?
Kaithlyn is classified as "Very Rare" and is more popular than 81.7% of all first names in the SSA database. A total of 383 births have been registered with this name since 1880.
When was Kaithlyn most popular?
Kaithlyn reached peak popularity in 2002, when 21 babies were given this name. The average age of a living person named Kaithlyn is approximately 20 years old, reflecting when the name was most commonly given.
Is Kaithlyn a female name?
Kaithlyn is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Kaithlyn Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kaithlyn Smith, Kaithlyn Johnson, Kaithlyn 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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