Thea Gill
There are approximately 4 people named Thea Gill living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 85,688,585 Americans.
This estimate combines SSA birth records for the first name Thea with Census Bureau frequency data for the surname Gill. Below you will find a breakdown of both names, including popularity trends, gender data, and Census demographics where available.
Expected bearers
4
1 in 85,688,585
Named Thea
17K
Alive today
Named Gill
87K
Alive today
US population
343M
Denominator
Estimated living: 17K
Rarity: Uncommon
Gender: Female
Peak year: 2018
Average age: 20
Top Census group: White (73.0%)
Estimated bearers: 87K
Rarity: Uncommon
Census rank: #424
Per 100K: 25.27
Top ancestry: White (60.1%)
First name trend
Thea: popularity over time
Year-by-year SSA birth registrations for the first name Thea. The peak year was 2018 with 1,208 births. The average person named Thea today is 20 years old.
Babies born per year
Demographics
Ancestry and ethnicity for Thea
Self-reported race and ethnicity breakdown for people with the first name Thea, from the 2020 US Census Bureau first-name tables. The largest published group is White at 73.0%.
The bar chart below shows how people with the first name Thea described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the name Thea at the time of the Census. A first name does not determine a person's race or ethnicity.
- White73.0% · 9,784
- Black or African American7.1% · 950
- Asian and Pacific Islander7.0% · 942
- Two or more races6.6% · 886
- Hispanic or Latino5.5% · 736
- American Indian and Alaska Native0.8% · 112
Ethnicity
Ancestry of the Gill surname
Self-reported race and ethnicity breakdown for people with the surname Gill, from the 2020 US Census Bureau. The largest group is White at 60.1%.
The bar chart below shows how people with the surname Gill described their own race and ethnicity on the 2020 Census form. These are self-reported numbers, and they describe the population who happened to carry the surname Gill at the time of the Census. A surname does not determine a person's race or ethnicity.
- White60.1% · 45,397
- Asian and Pacific Islander17.9% · 13,493
- Black or African American12.7% · 9,625
- Hispanic or Latino5.1% · 3,858
- Two or more races3.7% · 2,775
- American Indian and Alaska Native0.5% · 387
Methodology
How we calculated this
The first name Thea has a living-bearer frequency of 0.0051% of the US population, based on 17,363 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
Even though the Census Bureau now publishes first-name tables, we do not use that file as the main first-name input for this estimate. The latest first-name Census snapshot is from 2020, which makes it 6 years old today. Because Census first-name data is only released once every 10 years, SSA birth records plus CDC survival rates give a better current estimate of how many people are likely alive with the name Thea right now.
The surname Gill appears at a rate of 25.27 per 100,000 residents in the 2020 Census Bureau surname file, which translates to a frequency of 0.0253%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 4 people with the full name Thea Gill. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Thea
Related
Other people with the surname Gill
FAQ
Thea Gill: questions and answers
How many people are named Thea Gill?
We estimate approximately 4 people in the United States share the full name Thea Gill. That works out to about 1 in 85,688,585 Americans. This is calculated by combining the first-name frequency (0.0051%) with the surname frequency (25.27 per 100K) against the current US population.
How rare is the name Thea Gill?
We classify Thea Gill as "Very Rare". About 1 in 85,688,585 Americans share this exact first and last name combination.
Is Thea a male or female name?
Thea is predominantly female. Out of 19,242 total SSA registrations, 0.0% were male and 100.0% were female. See the full Thea profile for detailed gender data.
Where does this data come from?
First-name data comes from the Social Security Administration's national baby name files (1880 to 2024). Surname data comes from the 2020 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.
How many people are named Thea Gill?
Our sister site HowManyOfMe.org answers how common the name Thea Gill is at a glance, with the living-bearer count up front.