How Many People Are Named Theory?
An estimated 221 people in the United States have the first name Theory. It is used for both genders, with 63.7% female. The average bearer is 7 years old, and Theory peaked in popularity in 2022 with 32 births that year.
Below you will find a full statistical profile of Theory 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 Theory paired with any surname.
Estimated Living Americans
221
About 1 in 1,550,925 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
63.7% confidence
Average Age
7
years old
Peak Year
2022
32 births
Total Registered
223
since 1880
Gender Distribution for Theory
Theory is a genuinely unisex name, used for both males (36.3%) and females (63.7%). Out of 223 total births registered, 81 were male and 142 were female.
Theory as a male name
Ranked #10,763 in 2024
7 male births in 2024
Peak: 2022 (14 births)
Theory as a female name
Ranked #7,889 in 2024
14 female births in 2024
Peak: 2023 (19 births)
Theory: Popularity Over Time
SSA records for Theory span from the 2000s to the 2020s, covering 3 decades of naming data. The most popular decade for this name was the 2020s, when 124 babies were registered. Theory remains highly popular today, with recent registration numbers near its historical peak.
Theory by Decade
How has Theory 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.
Theory + Last Name Combinations
How many people share a full name with Theory as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Theory
Other first names starting with T with a similar number of bearers.
Theory: Questions and Answers
How many people in the U.S. are named Theory?
We estimate approximately 221 people named Theory 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 1,550,925 Americans share this first name.
Is Theory a common name?
Theory is classified as "Very Rare" and is more popular than 75.5% of all first names in the SSA database. A total of 223 births have been registered with this name since 1880.
When was Theory most popular?
Theory reached peak popularity in 2022, when 32 babies were given this name. The average age of a living person named Theory is approximately 7 years old, reflecting when the name was most commonly given.
Is Theory a female name?
Theory is predominantly female. 63.7% of people with this name are female. See the gender breakdown above for full details.
How many Theory Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Theory Smith, Theory Johnson, Theory 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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