2000
#23,037
National surname rank
Recorded bearers 1,036
First available Census row
Per 100,000 0.38
Rare Last name
Mongillo
An Italian surname derived from the Italian word "mongio" meaning bald or tonsured.
According to the 2020 US Census Bureau surname tables, roughly 1,032 Americans carry the last name Mongillo. That puts it at #28,233 in the national surname ranking, appearing at a frequency of 0.30 per 100,000 people (about 1 in 332,126 residents).
This page is the full Name Census profile for the Mongillo 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
1.0K
1 in 332,126
Census rank
#28,233
2020 decennial data
Per 100,000
0.3
Frequency rate
Recorded bearers
900
rare in the US
Popularity narrative
The Census Bureau recorded 900 bearers of the surname Mongillo in its 2020 decennial surname file. At a rate of 0.30 per 100,000 residents, it holds the 28233rd position in the national surname ranking.
Among Census respondents with the surname Mongillo, the largest self-reported group is White at 91.9%. The next largest groups are Two or More Races (3.6%) and Hispanic (2.9%).
Origin
Meaning and origin of Mongillo
The surname Mongillo finds its roots in the Italian region of Campania, particularly in the province of Avellino. It is believed to have originated as a nickname or an occupational name during the medieval period, deriving from the Italian word "mongio," which means "monk" or "friar."
One of the earliest recorded instances of the Mongillo surname can be traced back to the 14th century, where it appeared in historical documents from the town of Montefalcione in the province of Avellino. This suggests that the name may have initially been associated with individuals who had some connection to a monastic order or religious community in the region.
In the 15th century, the Mongillo surname was mentioned in the records of the Archivio di Stato di Napoli, which chronicled various legal and administrative documents from the Kingdom of Naples. This indicates that the name had become more widespread and established during this time period.
Notable individuals with the Mongillo surname throughout history include Gian Domenico Mongillo (1550-1631), an Italian architect and engineer who was involved in the construction of several notable buildings in Naples, including the Palazzo Reale di Napoli. Another notable figure was Pietro Mongillo (1670-1745), a renowned sculptor from Naples who created numerous works for churches and noble families in the region.
In the 19th century, Vincenzo Mongillo (1815-1892) was a prominent Italian politician and lawyer who served as a deputy in the Parliament of the Kingdom of Italy. He played a significant role in the unification of Italy and the drafting of the country's civil code.
More recently, Gaetano Mongillo (1922-2005) was an Italian actor and theater director who gained recognition for his performances on stage and in numerous films throughout the latter half of the 20th century.
While the Mongillo surname is most commonly associated with its Italian origins, it has also been found in other countries, particularly those with significant Italian diaspora populations, such as Argentina and the United States.
Demographics
Ancestry and ethnicity for Mongillo
Among Census respondents with the surname Mongillo, the largest self-reported group is White at 91.9%. The next largest groups are Two or More Races (3.6%) and Hispanic (2.9%).
The bar chart below shows how Mongillo 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 Mongillo surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.9% · 827
- Two or more races3.6% · 32
- Hispanic or Latino2.9% · 26
- Asian and Pacific Islander1.2% · 11
- Black or African American0.2% · 2
- American Indian and Alaska Native0.2% · 2
Timeline
Historical Census data for Mongillo
Mongillo 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
#22,749
National surname rank
Recorded bearers 1,126
+90 bearers (+8.7%)
Per 100,000 0.38
Rank movement Up 288 places
2020
#28,233
National surname rank
Recorded bearers 900
-226 bearers (-20.1%)
Per 100,000 0.30
Rank movement Down 5,484 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #23,037 | 1,036 | 0.38 | First available Census row | First available Census row |
| 2010 | #22,749 | 1,126 | 0.38 | +90 bearers (+8.7%) | Up 288 places |
| 2020 | #28,233 | 900 | 0.30 | -226 bearers (-20.1%) | Down 5,484 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 Mongillo 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 | #22,749 | #28,233 | -24.1% |
| Count | 1,126 | 900 | -20.1% |
| Per 100K | 0.38 | 0.30 | -20.8% |
Between the 2010 and 2020 Census, the number of Mongillo bearers went from 1,126 to 900 (-20.1% change). The surname moved down 5,484 positions in the national ranking, going from #22,749 to #28,233.
FAQ
Mongillo surname: questions and answers
How many people in the U.S. have the surname Mongillo?
Name Census estimates that about 1,032 living Americans carry the surname Mongillo. Using the current population baseline, that works out to roughly 1 in 332,126 residents.
How common is Mongillo?
Mongillo ranks #28,233 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.30 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 900 people with the surname Mongillo. That is different from the site's living-bearer estimate (1,032), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.3 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.30 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 Mongillo.
Has Mongillo become more or less common over time?
Between 2010 and 2020, the surname Mongillo went from 1,126 recorded bearers to 900. That is a decrease of 226 (-20.1%). In the national ranking it fell from #22,749 to #28,233.
What does the Census say about the background of Mongillo?
Among Census respondents with the surname Mongillo, the largest self-reported group is White at 91.9%. The next largest groups are Two or More Races (3.6%) and Hispanic (2.9%). 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 Mongillo in the 2020 Census, accounting for 91.9% (827 people in the source table).
What is the full ancestry breakdown?
Mongillo appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.9%), Two or More Races (3.6%), Hispanic (2.9%). 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 Mongillo (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 Mongillo mean?
An Italian surname derived from the Italian word "mongio" meaning bald or tonsured. 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 Mongillo (0.30 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 have the last name Mongillo?
For a quick modern take, check how many Americans have the surname Mongillo on our sister site HowManyOfMe.org.