How Many People Are Named Uilliam?
An estimated 52 people in the United States have the first name Uilliam. It is almost exclusively a male name. The average bearer is 7 years old, and Uilliam peaked in popularity in 2018 with 11 births that year.
Below you will find a full statistical profile of Uilliam as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Uilliam paired with any surname.
Key Insights
- Uilliam is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
52
About 1 in 6,591,430 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
7
years old
Peak Year
2018
11 births
Total Registered
52
since 1880
Gender Distribution for Uilliam
Uilliam is almost exclusively a male name. Out of 52 total births registered, 100.0% were male.
Uilliam as a male name
Ranked #14,055 in 2024
5 male births in 2024
Peak: 2018 (11 births)
Uilliam: Popularity Over Time
SSA records for Uilliam span from the 2010s to the 2020s, covering 2 decades of naming data. The most popular decade for this name was the 2010s, when 35 babies were registered. While Uilliam is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Uilliam by Decade
How has Uilliam tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Uilliam + Last Name Combinations
How many people share a full name with Uilliam as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Uilliam
Other first names starting with U with a similar number of bearers.
Uilliam: Questions and Answers
How many people in the U.S. are named Uilliam?
We estimate approximately 52 people named Uilliam are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 6,591,430 Americans share this first name.
Is Uilliam a common name?
Uilliam is classified as "Very Rare" and is more popular than 54.9% of all first names in the SSA database. A total of 52 births have been registered with this name since 1880.
When was Uilliam most popular?
Uilliam reached peak popularity in 2018, when 11 babies were given this name. The average age of a living person named Uilliam is approximately 7 years old, reflecting when the name was most commonly given.
Is Uilliam a male name?
Uilliam is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Uilliam Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Uilliam Smith, Uilliam Johnson, Uilliam Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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