How Many People Are Named William Seo?
There are approximately 56 people named William Seo living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 6,120,613 Americans.
This estimate combines SSA birth records for the first name William with Census Bureau frequency data for the surname Seo. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
56
1 in 6,120,613 Americans
Combination Rarity
Rare
First Name
View full profileWilliam
Last Name
View full profileSeo
William: Popularity Over Time
Year-by-year SSA birth registrations for the first name William. The peak year was 1947 with 67,155 births. The average person named William today is 54 years old.
Ancestry of the Seo Surname
Self-reported race and ethnicity breakdown for people with the surname Seo, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "William" has an estimated frequency of 0.681% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 0 life tables.
The surname "Seo" appears at a rate of 2.38 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 56 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named William
Other people with the surname Seo
William Seo: Questions and Answers
How many people are named William Seo?
We estimate approximately 56 people named William Seo are alive in the United States today. The first name William is shared by 2,335,115 Americans, and the surname Seo is shared by 7,994.
How rare is the name William Seo?
This name combination is classified as Rare, occurring at a rate of about 1 in 6,120,613 Americans. The first name William is very common and the surname Seo is rare.
Is William a male or female name?
William is predominantly male, with 99.6% of bearers being male and 0.4% female. It peaked in popularity in 1947 and the average bearer today is 54 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 0 life tables. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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