How Many People Are Named Siena Williams?
There are approximately 55 people named Siena Williams living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 6,231,897 Americans.
This estimate combines SSA birth records for the first name Siena 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
55
1 in 6,231,897 Americans
Combination Rarity
Rare
First Name
View full profileSiena
Last Name
View full profileWilliams
Siena: Popularity Over Time
Year-by-year SSA birth registrations for the first name Siena. The peak year was 2018 with 496 births. The average person named Siena today is 14 years old.
Ancestry of the First Name Siena
In the 2020 Census, the first name Siena was most commonly recorded among people who identified as White (65.27%). The next largest recorded groups were Hispanic (19.11%) and Two or More Races (9.08%).
These percentages describe the people who had the first name Siena 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 Siena rose or fell over time.
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.
How we calculated this
The first name "Siena" 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 Siena are likely to be alive now.
Multiplying these frequencies against the U.S. population of ~343 million gives 55 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Siena
Other people with the surname Williams
Siena Williams: Questions and Answers
How many people are named Siena Williams?
We estimate approximately 55 people named Siena Williams are alive in the United States today. The first name Siena is shared by 10,475 Americans, and the surname Williams is shared by 1,790,492.
How rare is the name Siena Williams?
This name combination is classified as Rare, occurring at a rate of about 1 in 6,231,897 Americans. The first name Siena is uncommon and the surname Williams is very common.
Is Siena a male or female name?
Siena is predominantly female, with 0.0% of bearers being male and 100.0% female. It peaked in popularity in 2018 and the average bearer today is 14 years old.
What does the Census say about the first name Siena?
In the 2020 Census, the first name Siena was most commonly recorded among people who identified as White (65.27%). The next largest recorded groups were Hispanic (19.11%) and Two or More Races (9.08%). 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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