How Many People Are Named Unknown Williams?

There are approximately 77 people named Unknown Williams living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 4,451,355 Americans.

This estimate combines SSA birth records for the first name Unknown with Census Bureau frequency data for the surname Williams. Below you will find a breakdown of both names, including popularity trends, gender data, and Census background data where it is available.

Estimated People with This Name

1 in 4,451,355 Americans

Combination Rarity

Rare

Very Rare Very Common

First Name

Unknown

Last Name

Williams

Est. Bearers 1,790,492

Census Rank #3

Per 100K 522.38

Rarity Very Common

Unknown: Popularity Over Time

Year-by-year SSA birth registrations for the first name Unknown. The peak year was 1954 with 1,193 births. The average person named Unknown today is 53 years old.

Male

Female

Ancestry of the Williams Surname

The surname Williams was most commonly recorded among people who identified as Black in the 2020 Census.

This is a self-reported race and ethnicity breakdown for people who had the surname Williams in the published Census surname tables. It gives useful context around who was recorded with the name, but it does not tell the full family history of every Boone line.

White

43.82%

Black

46.22%

Hispanic

3.50%

Asian/Pacific Islander

0.59%

American Indian/Alaska Native

0.78%

Two or More Races

5.08%

How we calculated this

The first name "Unknown" 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 522.38 per 100,000 people in the 2020 U.S. Census.

We do not use the Census first-name snapshot for the main estimate because it is only published once every 10 years. The latest public first-name Census file is from 2020, which is already 6 years old. SSA birth records plus CDC survival data give a better current estimate of how many people with the first name Unknown are likely to be alive now.

Multiplying these frequencies against the U.S. population of ~343 million gives 77 estimated people. This assumes first names and last names are statistically independent. Full methodology.

Other people named Unknown

Unknown Smith Unknown Johnson Unknown Brown Unknown Jones Unknown Garcia

Other people with the surname Williams

Michael Williams James Williams John Williams David Williams Robert Williams William Williams Christopher Williams Joseph Williams

Unknown Williams: Questions and Answers

How many people are named Unknown Williams?

We estimate approximately 77 people named Unknown Williams are alive in the United States today. The first name Unknown is shared by 14,649 Americans, and the surname Williams is shared by 1,790,492.

How rare is the name Unknown Williams?

This name combination is classified as Rare, occurring at a rate of about 1 in 4,451,355 Americans. The first name Unknown is uncommon and the surname Williams is very common.

Is Unknown a male or female name?

Unknown is predominantly male, with 50.1% of bearers being male and 49.9% female. It peaked in popularity in 1954 and the average bearer today is 53 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. When available, first-name Census background data comes from the 2020 U.S. Census Bureau first-name tables. Surname data comes from the 2020 U.S. Census Bureau. Full methodology.

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