Gillermo
Variation of William, from Old German meaning "will helmet" or "resolution protector".
Name Census estimates that about 499 living Americans carry the first name Gillermo. The name is used almost exclusively for boys. The average person named Gillermo today is around 45 years old, and the year with the single highest number of Gillermo births was 1993 (21 babies).
This page is the full Name Census profile for Gillermo. Below you will find a gender breakdown showing how the name splits between male and female registrations, a year-by-year popularity chart stretching back to 1880, decade-level totals, the top US states for this name, its meaning and etymology, and a set of frequently asked questions with data-backed answers.
People living today
499
~ 1 in 686,882 Americans
Peak year
1993
21 babies that year
Average age
45
years old
2011 SSA rank
#12,944
Tracked since 1922
Popularity
Gillermo: popularity over time
The SSA tracks Gillermo from the 1920s through to the 2010s, spanning 10 decades of birth certificate data. The biggest single decade for the name was the 1990s, with 138 total registrations. Usage has dropped considerably from its 1990s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Gillermo by decade
The table below breaks the full SSA timeline into ten-year windows. Each row shows how many male and female babies were given the name Gillermo during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Geography
Where Gillermos live
Origin
Meaning and history of Gillermo
The given name Gillermo originates from the Germanic languages, specifically from the Old German name Willahelm, which later evolved into the Old French form Guillaume. It is a compound name composed of two elements: "wil" meaning "will" or "desire," and "helm" meaning "helmet" or "protection."
This name has a rich historical background, with its earliest recorded use dating back to the 8th century. It gained prominence during the Middle Ages, particularly in France, where it was borne by several notable figures, including Guillaume le Conquérant (William the Conqueror), the first Norman king of England, who reigned from 1066 to 1087.
In the 12th century, the name Gillermo appeared in the epic poem "The Song of Roland," one of the oldest surviving works of French literature. This work celebrated the exploits of a Frankish military leader named Gillelmus, who fought alongside Charlemagne, the legendary king of the Franks.
One of the most famous bearers of the name Gillermo was Guillermo de Ockham, an English Franciscan friar, philosopher, and theologian born around 1285. He is renowned for his contributions to logic, physics, and the principle of parsimony, known as Occam's Razor.
Another notable figure was Guillermo Tell (William Tell), a legendary Swiss folk hero from the late 13th or early 14th century, known for his defiance against the Habsburg rulers and his exceptional archery skills.
In the 16th century, Gillermo Shakespeare (William Shakespeare), the renowned English playwright, poet, and actor, was born in 1564 and passed away in 1616. His works, including timeless plays like "Hamlet," "Macbeth," and "Romeo and Juliet," have had a profound influence on literature and the English language.
These are just a few examples of the many notable individuals throughout history who have borne the name Gillermo, highlighting its enduring presence across various cultures and time periods.
People
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.
Related
Other names starting with G
Other first names starting with G with a similar number of bearers.
FAQ
Gillermo: questions and answers
How many people in the U.S. are named Gillermo?
Name Census puts the figure at roughly 499 living Americans. We arrive at this by taking every SSA birth registration for Gillermo going back to 1880 and adjusting each cohort for expected survival using CDC actuarial life tables. The result is an age-weighted living-bearer count, not a raw birth total. That works out to about 1 in 686,882 US residents.
Is Gillermo a common name?
We classify Gillermo as "Very Rare". It ranks above 84.5% of all first names in the SSA dataset by living bearers. Across the full history of the data, 633 babies have been registered with this name.
When was Gillermo most popular?
The single biggest year for Gillermo was 1993, when 21 babies received the name. The fact that the average living Gillermo is about 45 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
Is Gillermo a male name?
Yes, 100.0% of people registered as Gillermo in the SSA data are male. You can see the full per-sex comparison in the gender distribution section above, which includes the latest year rank, birth count, and peak year for each sex.
Where does this data come from?
First-name figures come from the Social Security Administration's national baby name files, which cover every name on a birth certificate from 1880 to 2024. Living-bearer estimates layer in CDC actuarial life tables broken out by sex to account for mortality. The population baseline (342,754,338) is the Census Bureau's latest national estimate. You can read the full calculation on our methodology page.