How Many People Are Named Thomasin?
An estimated 58 people in the United States have the first name Thomasin. It is almost exclusively a female name. The average bearer is 12 years old, and Thomasin peaked in popularity in 2023 with 16 births that year.
Below you will find a full statistical profile of Thomasin as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, state-by-state birth registrations, and, when available, a 2020 Census snapshot showing who had the name at that point in time. You can also check how many people share the full name Thomasin paired with any surname.
Key Insights
- Thomasin is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
58
About 1 in 5,909,558 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
12
years old
Peak Year
2023
16 births
Total Registered
60
since 1880
Gender Distribution for Thomasin
Thomasin is almost exclusively a female name. Out of 60 total births registered, 100.0% were female.
Thomasin as a female name
Ranked #13,303 in 2024
7 female births in 2024
Peak: 2023 (16 births)
Thomasin: Popularity Over Time
SSA records for Thomasin span from the 1960s to the 2020s, covering 3 decades of naming data. The most popular decade for this name was the 2020s, when 50 babies were registered. Thomasin remains highly popular today, with recent registration numbers near its historical peak.
Thomasin by Decade
How has Thomasin 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.
Thomasin + Last Name Combinations
How many people share a full name with Thomasin as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Thomasin
Other first names starting with T with a similar number of bearers.
Thomasin: Questions and Answers
How many people in the U.S. are named Thomasin?
We estimate approximately 58 people named Thomasin 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 5,909,558 Americans share this first name.
Is Thomasin a common name?
Thomasin is classified as "Very Rare" and is more popular than 56.6% of all first names in the SSA database. A total of 60 births have been registered with this name since 1880.
When was Thomasin most popular?
Thomasin reached peak popularity in 2023, when 16 babies were given this name. The average age of a living person named Thomasin is approximately 12 years old, reflecting when the name was most commonly given.
What does the SSA popularity chart show?
The popularity chart tracks birth registrations, not people currently alive. It shows how often Thomasin was given to babies from 1880 through 2024, which is why it is the best tool on the page for seeing long-run naming trends.
Is Thomasin a female name?
Thomasin is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
Why can Thomasin have a lot of living bearers even if it is not trendy now?
Because a name can build up a large population over many decades. Thomasin peaked in 2023, and the average living bearer is about 12 years old, so a name can still have millions of living bearers even after it stops feeling current for newborns.
How many Thomasin Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Thomasin Smith, Thomasin Johnson, Thomasin 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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