How Many People Are Named Brennan Williams?

There are approximately 180 people named Brennan Williams living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 1,904,191 Americans.

This estimate combines SSA birth records for the first name Brennan 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

180

1 in 1,904,191 Americans

Combination Rarity

Uncommon

Very Rare Very Common

First Name

Brennan

Last Name

Williams

Est. Bearers 1,790,492

Census Rank #3

Per 100K 522.38

Rarity Very Common

Brennan: Popularity Over Time

Year-by-year SSA birth registrations for the first name Brennan. The peak year was 2009 with 1,550 births. The average person named Brennan today is 24 years old.

Male

Female

Ancestry of the First Name Brennan

These percentages describe the people who had the first name Brennan in the 2020 Census. They do not tell you the deeper origin or meaning of the name itself.

Read this as a snapshot of who already had the name in 2020, not as a trend line. The SSA chart above is still the better way to see how Brennan rose or fell over time.

White

81.95%

Black

4.61%

Hispanic

5.53%

Asian/Pacific Islander

1.58%

American Indian/Alaska Native

0.72%

Two or More Races

5.61%

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 "Brennan" has an estimated frequency of 0.0101% 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 Brennan are likely to be alive now.

Multiplying these frequencies against the U.S. population of ~343 million gives 180 estimated people. This assumes first names and last names are statistically independent. Full methodology.

Other people named Brennan

Brennan Smith Brennan Johnson Brennan Brown Brennan Jones Brennan Garcia Brennan Hunt Brennan Lockhart

Other people with the surname Williams

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

Brennan Williams: Questions and Answers

How many people are named Brennan Williams?

We estimate approximately 180 people named Brennan Williams are alive in the United States today. The first name Brennan is shared by 34,525 Americans, and the surname Williams is shared by 1,790,492.

How rare is the name Brennan Williams?

This name combination is classified as Uncommon, occurring at a rate of about 1 in 1,904,191 Americans. The first name Brennan is uncommon and the surname Williams is very common.

Is Brennan a male or female name?

Brennan is predominantly male, with 93.7% of bearers being male and 6.3% female. It peaked in popularity in 2009 and the average bearer today is 24 years old.

What does the Census say about the first name Brennan?

In the 2020 Census, the first name Brennan was most commonly recorded among people who identified as White (81.95%). The next largest recorded groups were Two or More Races (5.61%) and Hispanic (5.53%). These percentages describe the people who had the name in the 2020 Census, not the deeper origin of the name itself.

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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