How Many People Are Named Castle?
An estimated 343 people in the United States have the first name Castle. It is almost exclusively a male name. The average bearer is 11 years old, and Castle peaked in popularity in 2018 with 32 births that year.
Below you will find a full statistical profile of Castle 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 Castle paired with any surname.
Estimated Living Americans
343
About 1 in 999,284 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
11
years old
Peak Year
2018
32 births
Total Registered
367
since 1880
Gender Distribution for Castle
Castle is almost exclusively a male name. Out of 367 total births registered, 100.0% were male.
Castle as a male name
Ranked #4,201 in 2024
25 male births in 2024
Peak: 2018 (32 births)
Castle: Popularity Over Time
SSA records for Castle span from the 1910s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2010s, when 196 babies were registered. While Castle is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Castle by Decade
How has Castle 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.
Castle + Last Name Combinations
How many people share a full name with Castle as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Castle
Other first names starting with C with a similar number of bearers.
Castle: Questions and Answers
How many people in the U.S. are named Castle?
We estimate approximately 343 people named Castle 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 999,284 Americans share this first name.
Is Castle a common name?
Castle is classified as "Very Rare" and is more popular than 80.7% of all first names in the SSA database. A total of 367 births have been registered with this name since 1880.
When was Castle most popular?
Castle reached peak popularity in 2018, when 32 babies were given this name. The average age of a living person named Castle is approximately 11 years old, reflecting when the name was most commonly given.
Is Castle a male name?
Castle is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Castle Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Castle Smith, Castle Johnson, Castle 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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