2000
#144,908
National surname rank
Recorded bearers 105
First available Census row
Per 100,000 0.04
Very Rare Last name
Dellario
An Italian surname meaning "of the arrow" or "from the arrow".
According to the 2020 US Census Bureau surname tables, roughly 126 Americans carry the last name Dellario. That puts it at #149,446 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,720,273 residents).
This page is the full Name Census profile for the Dellario 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
126
1 in 2,720,273
Census rank
#149,446
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
110
very rare in the US
Popularity narrative
The Census Bureau recorded 110 bearers of the surname Dellario in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 149446th position in the national surname ranking.
Among Census respondents with the surname Dellario, the largest self-reported group is White at 80.0%. The next largest groups are Hispanic (8.2%) and Two or More Races (7.3%).
Origin
Meaning and origin of Dellario
The surname DELLARIO is of Italian origin, believed to have originated in the regions of Calabria and Sicily during the medieval period. It is thought to be derived from the Italian word "dell'aria," which translates to "of the air" or "airy," possibly referring to a person living in an elevated or breezy location.
One of the earliest recorded instances of the name DELLARIO can be found in the Sicilian town of Noto, where a family by that name is mentioned in municipal records dating back to the 15th century. The name also appears in historical documents from the city of Reggio Calabria in the 16th century.
During the Renaissance period, a notable figure bearing the surname DELLARIO was Giacomo Dellario (1520-1592), a renowned painter from the town of Tropea in Calabria. His works, which included religious frescoes and portraits, adorned several churches and noble households in the region.
In the 18th century, a branch of the DELLARIO family migrated to Naples, where they established themselves as merchants and landowners. One of their descendants, Antonio Dellario (1745-1814), was a prominent lawyer and advisor to the Neapolitan court.
Another individual of historical significance was Maria Dellario (1825-1898), a philanthropist from the town of Rende in Calabria. She founded several schools and orphanages in the region, earning her the respect and admiration of the local community.
The name DELLARIO also found its way to other parts of Italy, including the northern regions of Lombardy and Piedmont. In the city of Milan, records from the 19th century mention a family of artists and sculptors bearing the surname, including Gian Maria Dellario (1810-1878), whose works can be found in several churches and museums in the area.
While the DELLARIO surname may have originated in the southern regions of Italy, its presence and influence can be traced throughout the country's history, with individuals from various professions and backgrounds leaving their mark on the cultural and societal fabric of their respective communities.
Demographics
Ancestry and ethnicity for Dellario
Among Census respondents with the surname Dellario, the largest self-reported group is White at 80.0%. The next largest groups are Hispanic (8.2%) and Two or More Races (7.3%).
The bar chart below shows how Dellario 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 Dellario surname at the time of the 2020 Census, not any inherent property of the name itself.
- White80.0% · 88
- Hispanic or Latino8.2% · 9
- Two or more races7.3% · 8
- Asian and Pacific Islander3.6% · 4
- American Indian and Alaska Native0.9% · 1
Timeline
Historical Census data for Dellario
Dellario 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
#147,253
National surname rank
Recorded bearers 112
+7 bearers (+6.7%)
Per 100,000 0.04
Rank movement Down 2,345 places
2020
#149,446
National surname rank
Recorded bearers 110
-2 bearers (-1.8%)
Per 100,000 0.04
Rank movement Down 2,193 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #144,908 | 105 | 0.04 | First available Census row | First available Census row |
| 2010 | #147,253 | 112 | 0.04 | +7 bearers (+6.7%) | Down 2,345 places |
| 2020 | #149,446 | 110 | 0.04 | -2 bearers (-1.8%) | Down 2,193 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 Dellario 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 | #147,253 | #149,446 | -1.5% |
| Count | 112 | 110 | -1.8% |
| Per 100K | 0.04 | 0.04 | -8.0% |
Between the 2010 and 2020 Census, the number of Dellario bearers went from 112 to 110 (-1.8% change). The surname moved down 2,193 positions in the national ranking, going from #147,253 to #149,446.
FAQ
Dellario surname: questions and answers
How many people in the U.S. have the surname Dellario?
Name Census estimates that about 126 living Americans carry the surname Dellario. Using the current population baseline, that works out to roughly 1 in 2,720,273 residents.
How common is Dellario?
Dellario ranks #149,446 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.04 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 110 people with the surname Dellario. That is different from the site's living-bearer estimate (126), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.04 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 Dellario.
Has Dellario become more or less common over time?
Between 2010 and 2020, the surname Dellario went from 112 recorded bearers to 110. That is a decrease of 2 (-1.8%). In the national ranking it fell from #147,253 to #149,446.
What does the Census say about the background of Dellario?
Among Census respondents with the surname Dellario, the largest self-reported group is White at 80.0%. The next largest groups are Hispanic (8.2%) and Two or More Races (7.3%). 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 Dellario in the 2020 Census, accounting for 80.0% (88 people in the source table).
What is the full ancestry breakdown?
Dellario appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (80.0%), Hispanic (8.2%), Two or More Races (7.3%). 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 Dellario (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 Dellario mean?
An Italian surname meaning "of the arrow" or "from the arrow". 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 Dellario (0.04 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 Dellario?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.