How Many People Are Named Gillermo?
An estimated 499 people in the United States have the first name Gillermo. It is almost exclusively a male name. The average bearer is 45 years old, and Gillermo peaked in popularity in 1993 with 21 births that year.
Below you will find a full statistical profile of Gillermo 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 Gillermo paired with any surname.
Estimated Living Americans
499
About 1 in 686,882 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
45
years old
Peak Year
1993
21 births
Total Registered
633
since 1880
Gender Distribution for Gillermo
Gillermo is almost exclusively a male name. Out of 633 total births registered, 100.0% were male.
Gillermo as a male name
Ranked #12,944 in 2011
5 male births in 2011
Peak: 1993 (21 births)
Gillermo: Popularity Over Time
SSA records for Gillermo span from the 1920s to the 2010s, covering 10 decades of naming data. The most popular decade for this name was the 1990s, when 138 babies were registered. Gillermo has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Gillermo by Decade
How has Gillermo 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.
Gillermo by State
Gillermo + Last Name Combinations
How many people share a full name with Gillermo as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Gillermo
Other first names starting with G with a similar number of bearers.
Gillermo: Questions and Answers
How many people in the U.S. are named Gillermo?
We estimate approximately 499 people named Gillermo 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 686,882 Americans share this first name.
Is Gillermo a common name?
Gillermo is classified as "Very Rare" and is more popular than 84.5% of all first names in the SSA database. A total of 633 births have been registered with this name since 1880.
When was Gillermo most popular?
Gillermo reached peak popularity in 1993, when 21 babies were given this name. The average age of a living person named Gillermo is approximately 45 years old, reflecting when the name was most commonly given.
Is Gillermo a male name?
Gillermo is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Gillermo Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Gillermo Smith, Gillermo Johnson, Gillermo 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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