How Many People Are Named Theresia?
An estimated 918 people in the United States have the first name Theresia. It is almost exclusively a female name. The average bearer is 62 years old, and Theresia peaked in popularity in 1959 with 58 births that year.
Below you will find a full statistical profile of Theresia 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 Theresia paired with any surname.
Estimated Living Americans
918
About 1 in 373,371 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
62
years old
Peak Year
1959
58 births
Total Registered
2,016
since 1880
Gender Distribution for Theresia
Theresia is almost exclusively a female name. Out of 2,016 total births registered, 100.0% were female.
Theresia as a female name
Ranked #15,351 in 2007
7 female births in 2007
Peak: 1959 (58 births)
Theresia: Popularity Over Time
SSA records for Theresia span from the 1880s to the 2000s, covering 13 decades of naming data. The most popular decade for this name was the 1950s, when 375 babies were registered. Theresia has declined significantly from its peak in the 1950s. Recent registrations are a fraction of what they were at the name's height.
Theresia by Decade
How has Theresia 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.
Theresia by State
Birth registrations for Theresia span all 11 states and territories in the SSA database. The highest counts are in Texas, California, Georgia. The lowest are in Pennsylvania, New York, North Dakota. On average, about 9 Theresias were registered per state.
Theresia + Last Name Combinations
How many people share a full name with Theresia as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Theresia
Other first names starting with T with a similar number of bearers.
Theresia: Questions and Answers
How many people in the U.S. are named Theresia?
We estimate approximately 918 people named Theresia 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 373,371 Americans share this first name.
Is Theresia a common name?
Theresia is classified as "Very Rare" and is more popular than 89.5% of all first names in the SSA database. A total of 2,016 births have been registered with this name since 1880.
When was Theresia most popular?
Theresia reached peak popularity in 1959, when 58 babies were given this name. The average age of a living person named Theresia is approximately 62 years old, reflecting when the name was most commonly given.
Is Theresia a female name?
Theresia is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Theresia Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Theresia Smith, Theresia Johnson, Theresia 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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