How Many People Are Named Castyn?
An estimated 16 people in the United States have the first name Castyn. It is almost exclusively a male name. The average bearer is 8 years old, and Castyn peaked in popularity in 2019 with 6 births that year.
Below you will find a full statistical profile of Castyn 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 Castyn paired with any surname.
Key Insights
- Castyn is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
16
About 1 in 21,422,146 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
8
years old
Peak Year
2019
6 births
Total Registered
16
since 1880
Gender Distribution for Castyn
Castyn is almost exclusively a male name. Out of 16 total births registered, 100.0% were male.
Castyn as a male name
Ranked #12,460 in 2021
5 male births in 2021
Peak: 2019 (6 births)
Castyn: Popularity Over Time
SSA records for Castyn span from the 2010s to the 2020s, covering 2 decades of naming data. The most popular decade for this name was the 2010s, when 11 babies were registered. While Castyn is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Castyn by Decade
How has Castyn 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.
Castyn + Last Name Combinations
How many people share a full name with Castyn as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Castyn
Other first names starting with C with a similar number of bearers.
Castyn: Questions and Answers
How many people in the U.S. are named Castyn?
We estimate approximately 16 people named Castyn 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 21,422,146 Americans share this first name.
Is Castyn a common name?
Castyn is classified as "Very Rare" and is more popular than 36.5% of all first names in the SSA database. A total of 16 births have been registered with this name since 1880.
When was Castyn most popular?
Castyn reached peak popularity in 2019, when 6 babies were given this name. The average age of a living person named Castyn is approximately 8 years old, reflecting when the name was most commonly given.
Is Castyn a male name?
Castyn is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Castyn Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Castyn Smith, Castyn Johnson, Castyn 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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