Guilio
A masculine Italian name of disputed origin, possibly meaning "downy" or "youthful".
Name Census estimates that about 3 living Americans carry the first name Guilio. The name is used almost exclusively for boys. The average person named Guilio today is around 96 years old, and the year with the single highest number of Guilio births was 1927 (8 babies).
This page is the full Name Census profile for Guilio. 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.
Key insights
- • The typical person named Guilio is about 96 years old today, placing it firmly among the names of earlier generations. Most living Guilios were born before 1940.
- • Fewer than 100 living Americans are believed to carry the name Guilio. It is among the rarest names in the SSA records.
People living today
3
~ 1 in 114,251,446 Americans
Peak year
1927
8 babies that year
Average age
96
years old
1941 SSA rank
#3,287
Tracked since 1924
Popularity
Guilio: popularity over time
The SSA tracks Guilio from the 1920s through to the 1940s, spanning 2 decades of birth certificate data. The biggest single decade for the name was the 1920s, with 20 total registrations. Usage has dropped considerably from its 1920s peak. The most recent decade brought in only a fraction of the registrations that the name once attracted.
Babies born per year
Decades
Guilio 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 Guilio during that decade, along with a combined total. This is useful for spotting eras where the name surged or retreated.
Origin
Meaning and history of Guilio
The name Guilio is derived from the Italian form of the Roman name Julius, which traces its roots back to the ancient Roman gens (clan) Julia. The name Julius is believed to have originated from the word "iulus," meaning "downy-bearded," referring to the soft hair of youth.
The name gained widespread recognition and popularity due to its association with the influential Roman family of the Julii, which produced several prominent figures in Roman history. One of the most famous bearers of the name was Gaius Julius Caesar, the celebrated Roman military leader, statesman, and author who played a pivotal role in the demise of the Roman Republic and the establishment of the Roman Empire.
During the Middle Ages, the Italian variant Guilio emerged as a derivative of the Roman name Julius. This form was commonly used in various regions of Italy, particularly in the northern and central parts of the country. It gained further prominence during the Renaissance period, a time of cultural rebirth and a resurgence of interest in classical Roman culture and names.
One notable figure who bore the name Guilio was Guilio Romano (c. 1499-1546), an Italian painter, architect, and interior decorator who worked in the Mannerist style. He was a prominent student of Raphael and played a significant role in the development of the Mannerist movement in Italian art.
Another historical figure with the name Guilio was Guilio Caccini (c. 1551-1618), an Italian composer and singer who was a leading figure in the early Baroque period. He is particularly renowned for his contributions to the development of monody, a style of solo vocal composition accompanied by simple chordal accompaniment.
In the field of science, Guilio Cesare Aranzio (1530-1589) was an Italian anatomist and physician who made significant contributions to the study of human anatomy. He is best known for his detailed descriptions of the anatomy of the ear and the development of the fetus.
Additionally, Guilio Douhet (1869-1930) was an Italian general and air power theorist who greatly influenced the development of modern military aviation. His seminal work, "The Command of the Air," published in 1921, outlined his vision for the strategic use of airpower and its potential to decisively influence the outcome of future wars.
Throughout history, the name Guilio has been associated with individuals from various fields, including the arts, music, science, and military, reflecting its enduring popularity and cultural significance within the Italian tradition.
People
Guilio + last name combinations
How many people share a full name with Guilio 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
Guilio: questions and answers
How many people in the U.S. are named Guilio?
Name Census puts the figure at roughly 3 living Americans. We arrive at this by taking every SSA birth registration for Guilio 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 114,251,446 US residents.
Is Guilio a common name?
We classify Guilio as "Very Rare". It ranks above 4.9% of all first names in the SSA dataset by living bearers. Across the full history of the data, 26 babies have been registered with this name.
When was Guilio most popular?
The single biggest year for Guilio was 1927, when 8 babies received the name. The fact that the average living Guilio is about 96 years old gives you a rough sense of which era contributed the most bearers who are still alive today.
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 Guilio in that year. That makes it useful for spotting when the name rose, peaked, or faded.
Is Guilio a male name?
Yes, 100.0% of people registered as Guilio 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 Guilio still being used today?
Yes. The SSA still recorded Guilio 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 Guilio 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.
Does every first name have Census demographic data?
No. The public Census first-name release only covers names that met the Bureau's publication rules, so many rarer names in the SSA files do not have a published Census demographic snapshot. In those cases, the page still shows the SSA trend, gender history, and state data.
How many people have Guilio as a first name?
If you just want to know how many people share the name Guilio, HowManyOfMe.org gives you the headline number in one glance.