How Many People Are Named Jillian Thomas?
There are approximately 197 people named Jillian Thomas living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 1,739,870 Americans.
This estimate combines SSA birth records for the first name Jillian with Census Bureau frequency data for the surname Thomas. 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
197
1 in 1,739,870 Americans
Combination Rarity
Uncommon
First Name
View full profileJillian
Last Name
View full profileThomas
Jillian: Popularity Over Time
Year-by-year SSA birth registrations for the first name Jillian. The peak year was 1982 with 3,070 births. The average person named Jillian today is 30 years old.
Ancestry of the First Name Jillian
In the 2020 Census, the first name Jillian was most commonly recorded among people who identified as White (82.71%). The next largest recorded groups were Hispanic (6.77%) and Two or More Races (3.91%).
These percentages describe the people who had the first name Jillian 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 Jillian rose or fell over time.
Ancestry of the Thomas Surname
The surname Thomas 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 Thomas 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 "Jillian" has an estimated frequency of 0.0234% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Thomas" appears at a rate of 245.68 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 Jillian are likely to be alive now.
Multiplying these frequencies against the U.S. population of ~343 million gives 197 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Jillian
Other people with the surname Thomas
Jillian Thomas: Questions and Answers
How many people are named Jillian Thomas?
We estimate approximately 197 people named Jillian Thomas are alive in the United States today. The first name Jillian is shared by 80,195 Americans, and the surname Thomas is shared by 842,092.
How rare is the name Jillian Thomas?
This name combination is classified as Uncommon, occurring at a rate of about 1 in 1,739,870 Americans. The first name Jillian is uncommon and the surname Thomas is very common.
Is Jillian a male or female name?
Jillian is predominantly female, with 0.3% of bearers being male and 99.7% female. It peaked in popularity in 1982 and the average bearer today is 30 years old.
What does the Census say about the first name Jillian?
In the 2020 Census, the first name Jillian was most commonly recorded among people who identified as White (82.71%). The next largest recorded groups were Hispanic (6.77%) and Two or More Races (3.91%). 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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