2010
#157,234
National surname rank
Recorded bearers 103
First available Census row
Per 100,000 0.03
Very Rare Last name
Debiaso
Locative Italian surname referring to someone from Biase or Biagio.
According to the 2020 US Census Bureau surname tables, roughly 118 Americans carry the last name Debiaso. 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 Debiaso 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 Debiaso 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 Debiaso, the largest self-reported group is White at 82.5%. The next largest groups are Hispanic (6.8%) and American Indian/Alaska Native (6.8%).
Origin
Meaning and origin of Debiaso
The surname DEBIASO originated in Italy, likely in the northern regions near the city of Milan. It is believed to have derived from the Italian words "de" meaning "from" and "biaso" which was a medieval surname or nickname referring to someone with a speech impediment or lisp. The name can be traced back to the 13th century in records from the province of Lombardy.
One of the earliest recorded instances of the name appears in the historical records of the city of Pavia in 1274, where a Petrus de Biaso is mentioned as a landowner. Another early reference is found in a 1298 document from Bergamo, which lists a Giovanni Debiaso as a merchant and guild member.
In the 14th century, the name Debiaso appeared in various forms such as De Biasio, De Biasiis, and Biasiotti, reflecting regional spelling variations. A notable example is Francesco de Biasiis, a renowned painter from Milan who lived from 1359 to 1428.
During the Renaissance period, the surname spread across northern Italy and several individuals bearing the name gained prominence. One such figure was Girolamo Debiaso, a scholar and humanist from Verona who lived from 1498 to 1567.
In the 17th century, the Debiaso family established itself in Venice, where they were involved in the city's vibrant maritime trade. A notable member was Antonio Debiaso, a successful merchant and ship owner who lived from 1621 to 1689.
As the name spread throughout Italy, it also took on various regional variations, such as Debiasi, Debiagio, and Debias. In the late 18th century, a prominent member of the family was Giacomo Debiasi, a military officer and patriot who fought against the Austrian Empire during the Italian unification movement. He was born in 1789 and died in 1857.
Another significant figure with the surname was Giuseppe Debiaso, an Italian painter and sculptor who lived from 1861 to 1924. He was known for his realistic portraits and religious works, which can be found in churches and museums throughout Italy.
Demographics
Ancestry and ethnicity for Debiaso
Among Census respondents with the surname Debiaso, the largest self-reported group is White at 82.5%. The next largest groups are Hispanic (6.8%) and American Indian/Alaska Native (6.8%).
The bar chart below shows how Debiaso 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 Debiaso surname at the time of the 2020 Census, not any inherent property of the name itself.
- White82.5% · 85
- Hispanic or Latino6.8% · 7
- American Indian and Alaska Native6.8% · 7
- Two or more races2.9% · 3
- Asian and Pacific Islander1.0% · 1
Timeline
Historical Census data for Debiaso
Debiaso 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
+0 bearers (+0.0%)
Per 100,000 0.03
Rank movement Up 3,052 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #157,234 | 103 | 0.03 | First available Census row | First available Census row |
| 2020 | #154,182 | 103 | 0.03 | +0 bearers (+0.0%) | Up 3,052 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 Debiaso 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 | #157,234 | #154,182 | 1.9% |
| Count | 103 | 103 | 0.0% |
| Per 100K | 0.03 | 0.03 | 14.9% |
Between the 2010 and 2020 Census, the number of Debiaso bearers went from 103 to 103 (+0.0% change). The surname moved up 3,052 positions in the national ranking, going from #157,234 to #154,182.
FAQ
Debiaso surname: questions and answers
How many people in the U.S. have the surname Debiaso?
Name Census estimates that about 118 living Americans carry the surname Debiaso. Using the current population baseline, that works out to roughly 1 in 2,904,698 residents.
How common is Debiaso?
Debiaso 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 Debiaso. 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 Debiaso.
Has Debiaso become more or less common over time?
Between 2010 and 2020, the surname Debiaso went from 103 recorded bearers to 103. That is an increase of 0 (+0.0%). In the national ranking it rose from #157,234 to #154,182.
What does the Census say about the background of Debiaso?
Among Census respondents with the surname Debiaso, the largest self-reported group is White at 82.5%. The next largest groups are Hispanic (6.8%) and American Indian/Alaska Native (6.8%). 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 Debiaso in the 2020 Census, accounting for 82.5% (85 people in the source table).
What is the full ancestry breakdown?
Debiaso appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (82.5%), Hispanic (6.8%), American Indian/Alaska Native (6.8%). 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 Debiaso (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 Debiaso mean?
Locative Italian surname referring to someone from Biase or Biagio. 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 Debiaso (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 Debiaso?
You can see how many people have the last name Debiaso on our sister site HowManyOfMe.org — same data roots, lighter UI.