How Many People Are Named Thelonious?
An estimated 444 people in the United States have the first name Thelonious. It is almost exclusively a male name. The average bearer is 20 years old, and Thelonious peaked in popularity in 2017 with 23 births that year.
Below you will find a full statistical profile of Thelonious 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 Thelonious paired with any surname.
Estimated Living Americans
444
About 1 in 771,969 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
20
years old
Peak Year
2017
23 births
Total Registered
455
since 1880
Gender Distribution for Thelonious
Thelonious is almost exclusively a male name. Out of 455 total births registered, 100.0% were male.
Thelonious as a male name
Ranked #5,847 in 2024
16 male births in 2024
Peak: 2017 (23 births)
Thelonious: Popularity Over Time
SSA records for Thelonious span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2010s, when 170 babies were registered. While Thelonious is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Thelonious by Decade
How has Thelonious 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.
Thelonious by State
Thelonious + Last Name Combinations
How many people share a full name with Thelonious as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Thelonious
Other first names starting with T with a similar number of bearers.
Thelonious: Questions and Answers
How many people in the U.S. are named Thelonious?
We estimate approximately 444 people named Thelonious 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 771,969 Americans share this first name.
Is Thelonious a common name?
Thelonious is classified as "Very Rare" and is more popular than 83.4% of all first names in the SSA database. A total of 455 births have been registered with this name since 1880.
When was Thelonious most popular?
Thelonious reached peak popularity in 2017, when 23 babies were given this name. The average age of a living person named Thelonious is approximately 20 years old, reflecting when the name was most commonly given.
Is Thelonious a male name?
Thelonious is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Thelonious Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Thelonious Smith, Thelonious Johnson, Thelonious 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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