2010
#159,712
National surname rank
Recorded bearers 101
First available Census row
Per 100,000 0.03
Very Rare Last name
Deiulio
An Italian surname meaning "of Julius" or "son of Julius."
According to the 2020 US Census Bureau surname tables, roughly 118 Americans carry the last name Deiulio. That puts it at #154,182 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,904,698 residents).
This page is the full Name Census profile for the Deiulio 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
118
1 in 2,904,698
Census rank
#154,182
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
103
very rare in the US
Popularity narrative
The Census Bureau recorded 103 bearers of the surname Deiulio in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 154182nd position in the national surname ranking.
Among Census respondents with the surname Deiulio, the largest self-reported group is White at 84.5%. The next largest groups are Hispanic (7.8%) and Two or More Races (7.8%).
Origin
Meaning and origin of Deiulio
The surname DEIULIO originates from Italy and is believed to have emerged during the late medieval period, around the 13th or 14th century. It is derived from the Latin "Iulius" or "Julius," a Roman family name that was quite common in ancient times. The prefix "de" suggests the name's association with a specific location or lineage.
DEIULIO is thought to have originated in the regions of Lazio, Campania, or Calabria, where variations of the name, such as "Giulio" or "De Iulio," were more prevalent. These regions were heavily influenced by the Roman Empire, which could explain the name's Latin roots.
One of the earliest recorded instances of the name can be found in a document from the 14th century, which mentions a family named "De Iulio" residing in the town of Gaeta, located in the province of Latina, Lazio. This document provides evidence of the surname's existence during that time period.
In the 15th century, a notable figure named Giovanni De Iulio (1432-1501) was a prominent Italian architect and engineer from Naples. He is best known for his work on the Castel Nuovo in Naples and the Palazzo di Venezia in Rome.
Another historical figure associated with this surname is Pietro De Iulio (1498-1562), a Neapolitan painter and sculptor active during the Italian Renaissance. His works can be found in various churches and museums throughout Italy.
During the 16th century, a member of the DEIULIO family, named Francesco De Iulio (1520-1589), was a renowned physician and philosopher from Calabria. He authored several medical treatises and was highly regarded for his contributions to the field of medicine.
In the 17th century, a notable figure named Giulio De Iulio (1635-1706) was a Baroque architect and sculptor from Naples. He designed several churches and palaces in the city, including the Chiesa di Santa Maria della Vita and Palazzo Caracciolo.
As the surname spread across Italy and beyond, variations in spelling emerged, such as "Deiulio," "Deiulius," and "Deiullis." These variations were often influenced by regional dialects and local customs.
While the surname DEIULIO may have had a modest beginning, it has left an indelible mark on various aspects of Italian history, from architecture and art to medicine and philosophy. The name's enduring presence serves as a testament to the rich cultural heritage of Italy and the lasting impact of its bearers throughout the centuries.
Demographics
Ancestry and ethnicity for Deiulio
Among Census respondents with the surname Deiulio, the largest self-reported group is White at 84.5%. The next largest groups are Hispanic (7.8%) and Two or More Races (7.8%).
The bar chart below shows how Deiulio 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 Deiulio surname at the time of the 2020 Census, not any inherent property of the name itself.
- White84.5% · 87
- Hispanic or Latino7.8% · 8
- Two or more races7.8% · 8
Timeline
Historical Census data for Deiulio
Deiulio appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#154,182
National surname rank
Recorded bearers 103
+2 bearers (+2.0%)
Per 100,000 0.03
Rank movement Up 5,530 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #159,712 | 101 | 0.03 | First available Census row | First available Census row |
| 2020 | #154,182 | 103 | 0.03 | +2 bearers (+2.0%) | Up 5,530 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 Deiulio 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 | #159,712 | #154,182 | 3.5% |
| Count | 101 | 103 | 2.0% |
| Per 100K | 0.03 | 0.03 | 14.9% |
Between the 2010 and 2020 Census, the number of Deiulio bearers went from 101 to 103 (+2.0% change). The surname moved up 5,530 positions in the national ranking, going from #159,712 to #154,182.
FAQ
Deiulio surname: questions and answers
How many people in the U.S. have the surname Deiulio?
Name Census estimates that about 118 living Americans carry the surname Deiulio. Using the current population baseline, that works out to roughly 1 in 2,904,698 residents.
How common is Deiulio?
Deiulio ranks #154,182 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.03 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 103 people with the surname Deiulio. That is different from the site's living-bearer estimate (118), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.03 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.03 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 Deiulio.
Has Deiulio become more or less common over time?
Between 2010 and 2020, the surname Deiulio went from 101 recorded bearers to 103. That is an increase of 2 (+2.0%). In the national ranking it rose from #159,712 to #154,182.
What does the Census say about the background of Deiulio?
Among Census respondents with the surname Deiulio, the largest self-reported group is White at 84.5%. The next largest groups are Hispanic (7.8%) and Two or More Races (7.8%). 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 Deiulio in the 2020 Census, accounting for 84.5% (87 people in the source table).
What is the full ancestry breakdown?
Deiulio appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (84.5%), Hispanic (7.8%), Two or More Races (7.8%). 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 Deiulio (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 Deiulio mean?
An Italian surname meaning "of Julius" or "son of Julius." 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 Deiulio (0.03 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 common is the surname Deiulio?
Our sister site HowManyOfMe.org answers how many people have the last name Deiulio at a glance, with the living-bearer count up front.