How Many People Are Named Guillaume?
An estimated 331 people in the United States have the first name Guillaume. It is almost exclusively a male name. The average bearer is 31 years old, and Guillaume peaked in popularity in 1997 with 19 births that year.
Below you will find a full statistical profile of Guillaume 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 Guillaume paired with any surname.
Estimated Living Americans
331
About 1 in 1,035,512 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
31
years old
Peak Year
1997
19 births
Total Registered
341
since 1880
Gender Distribution for Guillaume
Guillaume is almost exclusively a male name. Out of 341 total births registered, 100.0% were male.
Guillaume as a male name
Ranked #11,365 in 2024
6 male births in 2024
Peak: 1997 (19 births)
Guillaume: Popularity Over Time
SSA records for Guillaume span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 1990s, when 114 babies were registered. Guillaume has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Guillaume by Decade
How has Guillaume 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.
Guillaume + Last Name Combinations
How many people share a full name with Guillaume as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Guillaume
Other first names starting with G with a similar number of bearers.
Guillaume: Questions and Answers
How many people in the U.S. are named Guillaume?
We estimate approximately 331 people named Guillaume 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 1,035,512 Americans share this first name.
Is Guillaume a common name?
Guillaume is classified as "Very Rare" and is more popular than 80.3% of all first names in the SSA database. A total of 341 births have been registered with this name since 1880.
When was Guillaume most popular?
Guillaume reached peak popularity in 1997, when 19 babies were given this name. The average age of a living person named Guillaume is approximately 31 years old, reflecting when the name was most commonly given.
Is Guillaume a male name?
Guillaume is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Guillaume Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Guillaume Smith, Guillaume Johnson, Guillaume 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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