How Common is the First Name Uilliam?
We estimate that there are 52 people named Uilliam who are currently alive and were born in the United States. Uilliam is the 20,442nd most common for men, and the 48,268th most common overall.
How Old are People Named Uilliam?
The average person named Uilliam is 6.17 years old.
Is Uilliam a Popular Baby Name Right Now?
Fewer than 5 people named Uilliam were born in the U.S. in 2025.
The popularity of Uilliam peaked in 2018, when it was the 7,136th most popular name for baby boys.
Is Uilliam a Boy's Name or a Girl's Name?
Uilliam is almost exclusively a male name. The Social Security Administration does not record any females born with the name Uilliam.