How Many People Are Named Sullivan Williams?
There are approximately 84 people named Sullivan Williams living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 4,080,409 Americans.
This estimate combines SSA birth records for the first name Sullivan with Census Bureau frequency data for the surname Williams. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
84
1 in 4,080,409 Americans
Combination Rarity
Rare
First Name
View full profileSullivan
Last Name
View full profileWilliams
Sullivan: Popularity Over Time
Year-by-year SSA birth registrations for the first name Sullivan. The peak year was 2024 with 1,113 births. The average person named Sullivan today is 12 years old.
Ancestry of the Williams Surname
Self-reported race and ethnicity breakdown for people with the surname Williams, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Sullivan" has an estimated frequency of < 0.0001% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Williams" appears at a rate of 550.97 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 84 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Sullivan
Other people with the surname Williams
Sullivan Williams: Questions and Answers
How many people are named Sullivan Williams?
We estimate approximately 84 people named Sullivan Williams are alive in the United States today. The first name Sullivan is shared by 15,234 Americans, and the surname Williams is shared by 1,850,671.
How rare is the name Sullivan Williams?
This name combination is classified as Rare, occurring at a rate of about 1 in 4,080,409 Americans. The first name Sullivan is uncommon and the surname Williams is very common.
Is Sullivan a male or female name?
Sullivan is predominantly male, with 91.4% of bearers being male and 8.6% female. It peaked in popularity in 2024 and the average bearer today is 12 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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