2000
#8,227
National surname rank
Recorded bearers 3,706
First available Census row
Per 100,000 1.37
Rare Last name
Diorio
An Italian surname referring to someone from a place called Orio or Oriolo.
According to the 2020 US Census Bureau surname tables, roughly 3,851 Americans carry the last name Diorio. That puts it at #9,296 in the national surname ranking, appearing at a frequency of 1.12 per 100,000 people (about 1 in 89,004 residents).
This page is the full Name Census profile for the Diorio 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
3.9K
1 in 89,004
Census rank
#9,296
2020 decennial data
Per 100,000
1.1
Frequency rate
Recorded bearers
3.4K
rare in the US
Popularity narrative
The Census Bureau recorded 3,358 bearers of the surname Diorio in its 2020 decennial surname file. At a rate of 1.12 per 100,000 residents, it holds the 9296th position in the national surname ranking.
Among Census respondents with the surname Diorio, the largest self-reported group is White at 92.7%. The next largest groups are Hispanic (4.1%) and Two or More Races (2.1%).
Origin
Meaning and origin of Diorio
The surname DIORIO has its origins in Italy, dating back to the late medieval period. It is believed to have emerged from the Italian word "d'Iorio," which means "from Iorio" or "of Iorio." The name Iorio itself is a variant of the Latin name "Georgius," meaning "farmer" or "earth-worker."
One of the earliest recorded instances of the name DIORIO can be found in the Codice Diplomatico Barese, a collection of documents from the medieval city of Bari in southern Italy, dating back to the 12th century. The name was also present in various legal and administrative records from the Kingdom of Naples during the 13th and 14th centuries.
In the 15th century, a notable figure bearing the surname DIORIO was Giacomo Diorio, a renowned jurist and legal scholar from the city of Lecce in Apulia. He authored several treatises on civil and canon law, which were widely studied in universities across Italy.
During the 16th century, the DIORIO family gained prominence in the Kingdom of Naples, with several members holding influential positions in the local government and clergy. One such figure was Girolamo Diorio (1510-1581), who served as the Archbishop of Manfredonia and played a significant role in the Counter-Reformation movement.
In the 17th century, the name DIORIO was associated with the town of Casalnuovo di Napoli, located near the city of Naples. Records from this period mention several individuals with this surname, including Antonio Diorio (1612-1678), a renowned painter and fresco artist whose works adorned numerous churches and palaces in the region.
As the DIORIO family spread throughout Italy and beyond, the name underwent various spelling variations, such as D'Iorio, Di Iorio, and DeIorio. One notable figure from this era was Giuseppe Diorio (1762-1842), a celebrated composer and violinist from Naples who performed for royalty and nobility across Europe.
In the 19th century, the DIORIO surname gained recognition in the field of literature. Enrico Diorio (1819-1892) was an Italian poet and playwright who contributed to the Romantic movement in Italian literature, while his contemporary, Vincenzo Diorio (1825-1901), was a respected author and journalist known for his works on the history and culture of Naples.
Throughout its long history, the surname DIORIO has been carried by individuals from various walks of life, including artists, writers, clergy members, and scholars. While the name's origins can be traced back to the medieval period in southern Italy, it has since spread to other regions and countries, reflecting the diverse journeys and achievements of those who bear this distinctive surname.
Demographics
Ancestry and ethnicity for Diorio
Among Census respondents with the surname Diorio, the largest self-reported group is White at 92.7%. The next largest groups are Hispanic (4.1%) and Two or More Races (2.1%).
The bar chart below shows how Diorio 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 Diorio surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.7% · 3,114
- Hispanic or Latino4.1% · 137
- Two or more races2.1% · 71
- Asian and Pacific Islander0.6% · 21
- Black or African American0.4% · 15
Timeline
Historical Census data for Diorio
Diorio 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
#8,891
National surname rank
Recorded bearers 3,682
-24 bearers (-0.6%)
Per 100,000 1.25
Rank movement Down 664 places
2020
#9,296
National surname rank
Recorded bearers 3,358
-324 bearers (-8.8%)
Per 100,000 1.12
Rank movement Down 405 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #8,227 | 3,706 | 1.37 | First available Census row | First available Census row |
| 2010 | #8,891 | 3,682 | 1.25 | -24 bearers (-0.6%) | Down 664 places |
| 2020 | #9,296 | 3,358 | 1.12 | -324 bearers (-8.8%) | Down 405 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 Diorio 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 | #8,891 | #9,296 | -4.6% |
| Count | 3,682 | 3,358 | -8.8% |
| Per 100K | 1.25 | 1.12 | -10.1% |
Between the 2010 and 2020 Census, the number of Diorio bearers went from 3,682 to 3,358 (-8.8% change). The surname moved down 405 positions in the national ranking, going from #8,891 to #9,296.
FAQ
Diorio surname: questions and answers
How many people in the U.S. have the surname Diorio?
Name Census estimates that about 3,851 living Americans carry the surname Diorio. Using the current population baseline, that works out to roughly 1 in 89,004 residents.
How common is Diorio?
Diorio ranks #9,296 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.12 per 100,000 residents, which is about 1 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 3,358 people with the surname Diorio. That is different from the site's living-bearer estimate (3,851), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.12 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.12 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 1 of them to have the surname Diorio.
Has Diorio become more or less common over time?
Between 2010 and 2020, the surname Diorio went from 3,682 recorded bearers to 3,358. That is a decrease of 324 (-8.8%). In the national ranking it fell from #8,891 to #9,296.
What does the Census say about the background of Diorio?
Among Census respondents with the surname Diorio, the largest self-reported group is White at 92.7%. The next largest groups are Hispanic (4.1%) and Two or More Races (2.1%). 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 Diorio in the 2020 Census, accounting for 92.7% (3,114 people in the source table).
What is the full ancestry breakdown?
Diorio appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.7%), Hispanic (4.1%), Two or More Races (2.1%). 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 Diorio (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 Diorio mean?
An Italian surname referring to someone from a place called Orio or Oriolo. 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 Diorio (1.12 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 Americans have the surname Diorio?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.