2000
#114,852
National surname rank
Recorded bearers 141
First available Census row
Per 100,000 0.05
Very Rare Last name
Guglielmelli
An Italian surname derived from the medieval given name Guglielmo, meaning "resolute protector".
According to the 2020 US Census Bureau surname tables, roughly 155 Americans carry the last name Guglielmelli. That puts it at #131,120 in the national surname ranking, appearing at a frequency of 0.05 per 100,000 people (about 1 in 2,211,318 residents).
This page is the full Name Census profile for the Guglielmelli surname. You will find the Census Bureau frequency data, a multi-census history view, an ancestry and ethnicity breakdown based on self-reported demographics, the name's meaning and origin where available, and answers to the most common questions people ask about this surname.
Bearers in the US
155
1 in 2,211,318
Census rank
#131,120
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
135
very rare in the US
Popularity narrative
The Census Bureau recorded 135 bearers of the surname Guglielmelli in its 2020 decennial surname file. At a rate of 0.05 per 100,000 residents, it holds the 131120th position in the national surname ranking.
Among Census respondents with the surname Guglielmelli, the largest self-reported group is White at 85.2%. The next largest groups are Two or More Races (5.9%) and Hispanic (5.2%).
Origin
Meaning and origin of Guglielmelli
The surname Guglielmelli originated in Italy during the early medieval period. It is derived from the Italian personal name Guglielmo, which in turn comes from the Germanic Willahelm, meaning "will" and "helmet." The suffix "-elli" is a common Italian diminutive, indicating a smaller or more affectionate form of the name.
One of the earliest recorded instances of the name Guglielmelli can be found in a 13th-century document from the Umbrian town of Perugia. This document mentions a certain Guglielmello di Raniero, suggesting that the surname had already taken root in central Italy by that time.
In the 14th century, the name appears in several Florentine records, including a reference to a Guglielmello Bardi, a member of the influential Bardi family of bankers and merchants. This indicates that the Guglielmelli name had spread to other parts of Tuscany.
During the Renaissance, the name gained some prominence in the city of Siena. A prominent figure was the architect and sculptor Giacomo Guglielmelli, who was born in Siena around 1485 and is credited with designing several churches and palaces in the city.
Another notable individual was the 16th-century painter and fresco artist Domenico Guglielmelli, whose works can be found in various churches and buildings throughout Siena and the surrounding area.
In the 17th century, the name Guglielmelli appears in records from the Kingdom of Naples, particularly in the city of Salerno. One notable figure from this period was the philosopher and theologian Giovanni Battista Guglielmelli, who was born in Salerno in 1634 and wrote extensively on metaphysics and natural philosophy.
Moving into the 18th century, the name Guglielmelli can be found in various parts of central and southern Italy, including the Papal States and the Kingdom of the Two Sicilies. One prominent individual from this time was the mathematician and astronomer Giuseppe Guglielmelli, who was born in Rome in 1763 and contributed significantly to the study of celestial mechanics.
As the centuries progressed, the Guglielmelli name continued to be present in various regions of Italy, with individuals bearing this surname contributing to various fields, including literature, art, and academia.
Demographics
Ancestry and ethnicity for Guglielmelli
Among Census respondents with the surname Guglielmelli, the largest self-reported group is White at 85.2%. The next largest groups are Two or More Races (5.9%) and Hispanic (5.2%).
The bar chart below shows how Guglielmelli bearers 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 surname, the Bureau suppresses the figure to protect individual privacy, which is why some names show fewer than six slices.
Percentages are shown for every Census year so the breakdown stays comparable over time. When the source file also includes raw headcounts, Name Census shows those alongside the percentages in the legend.
Keep in mind that these are self-reported numbers. A person's surname does not determine their race or ethnicity, and the distribution you see here reflects the specific population who happened to carry the Guglielmelli surname at the time of the 2020 Census, not any inherent property of the name itself.
- White85.2% · 115
- Two or more races5.9% · 8
- Hispanic or Latino5.2% · 7
- Black or African American3.0% · 4
- Asian and Pacific Islander0.7% · 1
Timeline
Historical Census data for Guglielmelli
Guglielmelli appears in 3 published Census surname files: 2000, 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2010
#138,304
National surname rank
Recorded bearers 121
-20 bearers (-14.2%)
Per 100,000 0.04
Rank movement Down 23,452 places
2020
#131,120
National surname rank
Recorded bearers 135
+14 bearers (+11.6%)
Per 100,000 0.05
Rank movement Up 7,184 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #114,852 | 141 | 0.05 | First available Census row | First available Census row |
| 2010 | #138,304 | 121 | 0.04 | -20 bearers (-14.2%) | Down 23,452 places |
| 2020 | #131,120 | 135 | 0.05 | +14 bearers (+11.6%) | Up 7,184 places |
For 2020, the Census Bureau published race and Hispanic-origin columns as counts rather than percentages. Name Census converts those counts back into shares so the ancestry section stays comparable with the older surname files.
Year on year
2010 vs 2020 Census
How has the Guglielmelli surname changed between Census years? The chart shows bearer count side by side, and the table compares rank, count, and frequency.
Census year comparison
20102020
| Metric | 2010 | 2020 | Change |
|---|---|---|---|
| Rank | #138,304 | #131,120 | 5.2% |
| Count | 121 | 135 | 11.6% |
| Per 100K | 0.04 | 0.05 | 12.9% |
Between the 2010 and 2020 Census, the number of Guglielmelli bearers went from 121 to 135 (+11.6% change). The surname moved up 7,184 positions in the national ranking, going from #138,304 to #131,120.
FAQ
Guglielmelli surname: questions and answers
How many people in the U.S. have the surname Guglielmelli?
Name Census estimates that about 155 living Americans carry the surname Guglielmelli. Using the current population baseline, that works out to roughly 1 in 2,211,318 residents.
How common is Guglielmelli?
Guglielmelli ranks #131,120 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.05 per 100,000 residents, which is about 0 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 135 people with the surname Guglielmelli. That is different from the site's living-bearer estimate (155), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.05 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.05 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 0 of them to have the surname Guglielmelli.
Has Guglielmelli become more or less common over time?
Between 2010 and 2020, the surname Guglielmelli went from 121 recorded bearers to 135. That is an increase of 14 (+11.6%). In the national ranking it rose from #138,304 to #131,120.
What does the Census say about the background of Guglielmelli?
Among Census respondents with the surname Guglielmelli, the largest self-reported group is White at 85.2%. The next largest groups are Two or More Races (5.9%) and Hispanic (5.2%). These figures come from the 2020 Census Bureau surname tables, based on how respondents described their own race and ethnicity.
Which group reports this surname most often?
White is the largest self-reported group for the surname Guglielmelli in the 2020 Census, accounting for 85.2% (115 people in the source table).
What is the full ancestry breakdown?
Guglielmelli appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (85.2%), Two or More Races (5.9%), Hispanic (5.2%). For 2020, the source file also published raw headcounts for each group, which is why this page can show both percentages and counts in the ancestry section.
Is this page using the latest Census data?
Yes. This page is using the latest surname file currently loaded on Name Census, which is 2020. The historical section above also keeps any older Census surname entries we have for Guglielmelli (2000, 2010, 2020).
Does the Census include every surname?
No. The Census Bureau only publishes surnames that appeared at least 100 times in a given decennial Census. That means very rare surnames are excluded entirely, and a surname can appear in one Census release but disappear from a later one if it falls below the reporting threshold.
Why don't the ancestry percentages always add up to exactly 100%?
There are two main reasons: rounding and suppression. The Census Bureau rounds published values, and it may suppress very small cells to protect privacy. For 2020, the Bureau also published raw group counts rather than direct percentages, so Name Census converts those counts back into shares for comparability across census years.
What does Guglielmelli mean?
An Italian surname derived from the medieval given name Guglielmo, meaning "resolute protector". The fuller origin note on this page goes into more detail.
Where does the surname data come from?
All surname statistics on Name Census are drawn from the US Census Bureau's decennial surname frequency tables. These files list every surname that appeared 100 or more times in the 2020 Census, along with a count, a per-100,000 rate, and a self-reported demographic breakdown. You can read the full explanation on our methodology page.
How does Name Census estimate living bearers?
For surnames, Name Census does not age cohorts the way it does for first names. Instead, it takes the Census Bureau's published frequency for Guglielmelli (0.05 per 100,000) and applies that rate to the current U.S. resident population to estimate how many living Americans have the surname today.
How many people share the surname Guglielmelli?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.