How Many People Are Named Sienna Brown?
There are approximately 171 people named Sienna Brown living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 2,004,411 Americans.
This estimate combines SSA birth records for the first name Sienna with Census Bureau frequency data for the surname Brown. 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
171
1 in 2,004,411 Americans
Combination Rarity
Uncommon
First Name
View full profileSienna
Last Name
View full profileBrown
Sienna: Popularity Over Time
Year-by-year SSA birth registrations for the first name Sienna. The peak year was 2024 with 2,113 births. The average person named Sienna today is 13 years old.
Ancestry of the First Name Sienna
In the 2020 Census, the first name Sienna was most commonly recorded among people who identified as White (57.67%). The next largest recorded groups were Hispanic (24.06%) and Two or More Races (9.29%).
These percentages describe the people who had the first name Sienna 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 Sienna rose or fell over time.
Ancestry of the Brown Surname
The surname Brown was most commonly recorded among people who identified as White in the 2020 Census.
This is a self-reported race and ethnicity breakdown for people who had the surname Brown 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.
How we calculated this
The first name "Sienna" has an estimated frequency of 0.0107% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Brown" appears at a rate of 463.73 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 Sienna are likely to be alive now.
Multiplying these frequencies against the U.S. population of ~343 million gives 171 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Sienna
Other people with the surname Brown
Sienna Brown: Questions and Answers
How many people are named Sienna Brown?
We estimate approximately 171 people named Sienna Brown are alive in the United States today. The first name Sienna is shared by 36,821 Americans, and the surname Brown is shared by 1,589,457.
How rare is the name Sienna Brown?
This name combination is classified as Uncommon, occurring at a rate of about 1 in 2,004,411 Americans. The first name Sienna is uncommon and the surname Brown is very common.
Is Sienna a male or female name?
Sienna is predominantly female, with 0.0% of bearers being male and 100.0% female. It peaked in popularity in 2024 and the average bearer today is 13 years old.
What does the Census say about the first name Sienna?
In the 2020 Census, the first name Sienna was most commonly recorded among people who identified as White (57.67%). The next largest recorded groups were Hispanic (24.06%) and Two or More Races (9.29%). 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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