How Many People Are Named Thadeus?
An estimated 780 people in the United States have the first name Thadeus. It is almost exclusively a male name. The average bearer is 36 years old, and Thadeus peaked in popularity in 1918 with 27 births that year.
Below you will find a full statistical profile of Thadeus 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 Thadeus paired with any surname.
Estimated Living Americans
780
About 1 in 439,429 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
36
years old
Peak Year
1918
27 births
Total Registered
1,117
since 1880
Gender Distribution for Thadeus
Thadeus is almost exclusively a male name. Out of 1,117 total births registered, 100.0% were male.
Thadeus as a male name
Ranked #12,156 in 2024
6 male births in 2024
Peak: 1918 (27 births)
Thadeus: Popularity Over Time
SSA records for Thadeus span from the 1910s to the 2020s, covering 12 decades of naming data. The most popular decade for this name was the 2000s, when 173 babies were registered. Thadeus has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Thadeus by Decade
How has Thadeus 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.
Thadeus by State
Birth registrations for Thadeus span all 4 states and territories in the SSA database. The highest counts are in Pennsylvania, New York, Illinois. The lowest are in Wisconsin, Illinois, New York. On average, about 7 Thadeuss were registered per state.
Thadeus + Last Name Combinations
How many people share a full name with Thadeus as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Thadeus
Other first names starting with T with a similar number of bearers.
Thadeus: Questions and Answers
How many people in the U.S. are named Thadeus?
We estimate approximately 780 people named Thadeus 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 439,429 Americans share this first name.
Is Thadeus a common name?
Thadeus is classified as "Very Rare" and is more popular than 88.4% of all first names in the SSA database. A total of 1,117 births have been registered with this name since 1880.
When was Thadeus most popular?
Thadeus reached peak popularity in 1918, when 27 babies were given this name. The average age of a living person named Thadeus is approximately 36 years old, reflecting when the name was most commonly given.
Is Thadeus a male name?
Thadeus is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Thadeus Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Thadeus Smith, Thadeus Johnson, Thadeus 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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