How Many People Are Named Louis Pasteur?
There are approximately 1 people named Louis Pasteur living in the United States today. That makes this name combination very rare, occurring at a rate of about 1 in 342,754,338 Americans.
This estimate combines SSA birth records for the first name Louis with Census Bureau frequency data for the surname Pasteur. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
1
1 in 342,754,338 Americans
Combination Rarity
Very Rare
First Name
View full profileLouis
Last Name
View full profilePasteur
Louis: Popularity Over Time
Year-by-year SSA birth registrations for the first name Louis. The peak year was 1921 with 7,296 births. The average person named Louis today is 56 years old.
Ancestry of the Pasteur Surname
Self-reported race and ethnicity breakdown for people with the surname Pasteur, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Louis" has an estimated frequency of 0.0533% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Pasteur" appears at a rate of 0.10 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 1 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Louis
Louis Pasteur: Questions and Answers
How many people are named Louis Pasteur?
We estimate approximately 1 people named Louis Pasteur are alive in the United States today. The first name Louis is shared by 182,628 Americans, and the surname Pasteur is shared by 336.
How rare is the name Louis Pasteur?
This name combination is classified as Very Rare, occurring at a rate of about 1 in 342,754,338 Americans. The first name Louis is common and the surname Pasteur is very rare.
Is Louis a male or female name?
Louis is predominantly male, with 99.3% of bearers being male and 0.7% female. It peaked in popularity in 1921 and the average bearer today is 56 years old.
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. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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