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
Census
Gillermo in the 2020 Census
The 2020 Census recorded 455 people with the first name Gillermo, which placed it at #22,044 in the published first-name tables. This is a snapshot of people who already had the name at the time of the Census.
The SSA sections elsewhere on this page answer a different question: how often parents gave the name to babies over time. The "people living today" figure on this page is different again: it is a current estimate built from SSA birth records and age-based survival rates, so the two numbers are not expected to match exactly.
2020 Census rank
#22,044
National first-name rank
People counted
455
455 in the published race/origin table
Per 100,000
0.2
People with this name in 2020
Largest reported group
Hispanic or Latino
97.4% of people with this name
Demographics
Ancestry and ethnicity for Gillermo
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Gillermo is Hispanic at 97.4%. The next largest groups are White (2.6%). These figures describe the people who had the name in 2020, not any inherent property of the name itself.
The bar chart below shows how people with the first name Gillermo described their own race and ethnicity on the 2020 Census form. The Census Bureau groups responses into six broad categories: White, Black or African American, Hispanic or Latino, Asian and Pacific Islander, American Indian and Alaska Native, and Two or More Races. When a category has too few respondents for a given name, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown so the breakdown is easy to read across every published category. Because the 2020 Census first-name file also includes raw headcounts for each group, Name Census can show those alongside the percentages in the legend and hover tooltip.
Keep in mind that these are self-reported numbers. A first name does not determine a person's race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the name Gillermo at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino97.4% · 443
- White2.6% · 12
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.
How common was Gillermo in the 2020 Census?
The published 2020 Census first-name tables recorded 455 people with the name Gillermo, or 0.15 per 100,000 residents. That placed it at #22,044 in the national Census ranking for first names.
Why is the Census count different from the living estimate?
Because they measure different things. The Census figure is a count of people who had the name Gillermo in 2020. The living estimate aims to answer a current question instead: how many people with the name are alive today, based on SSA birth records and age-based survival rates. Since one number is a 2020 snapshot and the other is a present-day estimate, they are not expected to be identical.
What does the Census say about the gender split for Gillermo?
In the 2020 Census sex table, Gillermo appears almost entirely male. Of the 453 people counted with this name, 99.8% were male and only a very small share were female. The Census view is a snapshot of people living with the name in 2020, while the SSA section above tracks births across time.
What does the Census say about the background of people named Gillermo?
In the 2020 Census race and Hispanic-origin table, the largest reported group for people named Gillermo is Hispanic at 97.4%. The next largest groups are White (2.6%). These figures describe the people who had the name in 2020, not any inherent property of the name itself. The percentages in the chart above come from self-reported race and Hispanic-origin responses in the 2020 Census.
Which group reports the name Gillermo most often in the Census?
Hispanic is the largest reported group for people named Gillermo in the 2020 Census, accounting for 97.4% (443 people in the published table).
Why can the Census sex total and race total differ slightly?
The Census Bureau published separate 2020 tables for sex and for race/Hispanic origin, and the released figures can differ slightly because of privacy protection in the public files. That is why this page treats the gender section and the race/origin section as two related snapshots instead of forcing them into one identical total.
Does every first name have Census demographic data?
No. The public Census first-name release only includes names that met the Bureau's publication rules, so many rarer names in the SSA files have no Census demographic snapshot. When that happens, the SSA trend, gender history, and state sections still appear, but the 2020 Census demographic sections are omitted.
What does the SSA popularity chart show?
The chart tracks births, not the number of people alive with the name today. Each point shows how many babies were given the name Gillermo in that year. That makes it useful for spotting when the name rose, peaked, or faded.
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.
Is Gillermo still being used today?
Yes. The SSA still recorded Gillermo in 2024, and the page above shows its latest-year rank where available. A name can be well past its peak and still remain in steady use, especially if it built up a large population over earlier decades.
Why can a name have a lot of living bearers even if it is not trendy now?
Because living-bearer counts and current baby-name popularity measure different things. A name like Gillermo can build up a very large population over many decades, even if fewer parents are choosing it now than they did at its peak.
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.
How many Americans are named Gillermo?
You can see how many people have the name Gillermo on our sister site HowManyOfMe.org — same data roots, lighter UI.