How Many People Are Named Thaddaeus?
An estimated 999 people in the United States have the first name Thaddaeus. It is almost exclusively a male name. The average bearer is 27 years old, and Thaddaeus peaked in popularity in 2005 with 29 births that year.
Below you will find a full statistical profile of Thaddaeus 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 Thaddaeus paired with any surname.
Estimated Living Americans
999
About 1 in 343,097 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
27
years old
Peak Year
2005
29 births
Total Registered
1,035
since 1880
Gender Distribution for Thaddaeus
Thaddaeus is almost exclusively a male name. Out of 1,035 total births registered, 100.0% were male.
Thaddaeus as a male name
Ranked #5,846 in 2024
16 male births in 2024
Peak: 2005 (29 births)
Thaddaeus: Popularity Over Time
SSA records for Thaddaeus span from the 1920s to the 2020s, covering 9 decades of naming data. The most popular decade for this name was the 2000s, when 225 babies were registered. While Thaddaeus is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Thaddaeus by Decade
How has Thaddaeus 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.
Thaddaeus by State
Thaddaeus + Last Name Combinations
How many people share a full name with Thaddaeus as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Thaddaeus
Other first names starting with T with a similar number of bearers.
Thaddaeus: Questions and Answers
How many people in the U.S. are named Thaddaeus?
We estimate approximately 999 people named Thaddaeus 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 343,097 Americans share this first name.
Is Thaddaeus a common name?
Thaddaeus is classified as "Very Rare" and is more popular than 90.1% of all first names in the SSA database. A total of 1,035 births have been registered with this name since 1880.
When was Thaddaeus most popular?
Thaddaeus reached peak popularity in 2005, when 29 babies were given this name. The average age of a living person named Thaddaeus is approximately 27 years old, reflecting when the name was most commonly given.
Is Thaddaeus a male name?
Thaddaeus is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Thaddaeus Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Thaddaeus Smith, Thaddaeus Johnson, Thaddaeus 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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