How Many People Are Named Mary Hart?
There are approximately 657 people named Mary Hart living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 521,696 Americans.
This estimate combines SSA birth records for the first name Mary with Census Bureau frequency data for the surname Hart. Below you will find a breakdown of both names, including popularity trends, gender data, and Census background data where it is available.
Estimated People with This Name
657
1 in 521,696 Americans
Combination Rarity
Uncommon
First Name
View full profileMary
Last Name
View full profileHart
Mary: Popularity Over Time
Year-by-year SSA birth registrations for the first name Mary. The peak year was 1921 with 74,171 births. The average person named Mary today is 65 years old.
Ancestry of the First Name Mary
In the 2020 Census, the first name Mary was most commonly recorded among people who identified as White (81.14%). The next largest recorded groups were Black (9.31%) and Hispanic (5.60%).
These percentages describe the people who had the first name Mary in the 2020 Census. They do not tell you the deeper origin or meaning of the name itself.
Read this as a snapshot of who already had the name in 2020, not as a trend line. The SSA chart above is still the better way to see how Mary rose or fell over time.
Ancestry of the Hart Surname
The surname Hart was most commonly recorded among people who identified as White in the 2020 Census.
This is a self-reported race and ethnicity breakdown for people who had the surname Hart in the published Census surname tables. It gives useful context around who was recorded with the name, but it does not tell the full family history of every Boone line.
How we calculated this
The first name "Mary" has an estimated frequency of 0.436% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Hart" appears at a rate of 44.01 per 100,000 people in the 2020 U.S. Census.
We do not use the Census first-name snapshot for the main estimate because it is only published once every 10 years. The latest public first-name Census file is from 2020, which is already 6 years old. SSA birth records plus CDC survival data give a better current estimate of how many people with the first name Mary are likely to be alive now.
Multiplying these frequencies against the U.S. population of ~343 million gives 657 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Mary
Other people with the surname Hart
Mary Hart: Questions and Answers
How many people are named Mary Hart?
We estimate approximately 657 people named Mary Hart are alive in the United States today. The first name Mary is shared by 1,492,757 Americans, and the surname Hart is shared by 150,852.
How rare is the name Mary Hart?
This name combination is classified as Uncommon, occurring at a rate of about 1 in 521,696 Americans. The first name Mary is very common and the surname Hart is common.
Is Mary a male or female name?
Mary is predominantly female, with 0.4% of bearers being male and 99.6% female. It peaked in popularity in 1921 and the average bearer today is 65 years old.
What does the Census say about the first name Mary?
In the 2020 Census, the first name Mary was most commonly recorded among people who identified as White (81.14%). The next largest recorded groups were Black (9.31%) and Hispanic (5.60%). These percentages describe the people who had the name in the 2020 Census, not the deeper origin of the name itself.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. When available, first-name Census background data comes from the 2020 U.S. Census Bureau first-name tables. Surname data comes from the 2020 U.S. Census Bureau. Full methodology.
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