Thomas Petri
There are approximately 16 people named Thomas Petri living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 21,422,146 Americans.
This estimate combines SSA birth records for the first name Thomas with Census Bureau frequency data for the surname Petri. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Expected bearers
16
1 in 21,422,146
Named Thomas
1.5M
Alive today
Named Petri
3.6K
Alive today
US population
343M
Denominator
Estimated living: 1.5M
Rarity: Very Common
Gender: Male
Peak year: 1952
Average age: 55
Estimated bearers: 3.6K
Rarity: Rare
Census rank: #10,339
Per 100K: 1.06
Top ancestry: White (93.9%)
First name trend
Thomas: popularity over time
Year-by-year SSA birth registrations for the first name Thomas. The peak year was 1952 with 48,728 births. The average person named Thomas today is 55 years old.
Babies born per year
Ethnicity
Ancestry of the Petri surname
Self-reported race and ethnicity breakdown for people with the surname Petri, from the 2010 US Census Bureau. The largest group is White at 93.9%.
- White93.9%
- Hispanic or Latino2.8%
- Two or more races1.8%
- Asian and Pacific Islander0.8%
Methodology
How we calculated this
The first name Thomas has a living-bearer frequency of 0.4517% of the US population, based on 1,548,322 estimated living Americans carrying this first name (from SSA birth records going back to 1880, adjusted for mortality using CDC life tables).
The surname Petri appears at a rate of 1.06 per 100,000 residents in the 2010 Census Bureau surname file, which translates to a frequency of 0.0011%.
Multiplying these two independent frequencies against the current US population of 342,754,338 gives an expected count of approximately 16 people with the full name Thomas Petri. This assumes statistical independence between first and last names, which is a simplification but produces reasonable estimates for most combinations.
Related
Other people named Thomas
Related
Other people with the surname Petri
FAQ
Thomas Petri: questions and answers
How many people are named Thomas Petri?
We estimate approximately 16 people in the United States share the full name Thomas Petri. That works out to about 1 in 21,422,146 Americans. This is calculated by combining the first-name frequency (0.4517%) with the surname frequency (1.06 per 100K) against the current US population.
How rare is the name Thomas Petri?
We classify Thomas Petri as "Very Rare". About 1 in 21,422,146 Americans share this exact first and last name combination.
Is Thomas a male or female name?
Thomas is predominantly male. Out of 2,360,128 total SSA registrations, 99.6% were male and 0.4% were female. See the full Thomas 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 2010 US Census Bureau decennial surname tables. Living-bearer estimates use CDC actuarial life tables to adjust for mortality. Read the full methodology.