2010
#147,253
National surname rank
Recorded bearers 112
First available Census row
Per 100,000 0.04
Very Rare Last name
Otillio
A surname derived from the Germanic name Odilo, meaning "wealthy heir".
According to the 2020 US Census Bureau surname tables, roughly 123 Americans carry the last name Otillio. That puts it at #151,639 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,786,621 residents).
This page is the full Name Census profile for the Otillio 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
123
1 in 2,786,621
Census rank
#151,639
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
107
very rare in the US
Popularity narrative
The Census Bureau recorded 107 bearers of the surname Otillio in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 151639th position in the national surname ranking.
Among Census respondents with the surname Otillio, the largest self-reported group is White at 93.5%. The next largest groups are Hispanic (4.7%) and Black (1.9%).
Origin
Meaning and origin of Otillio
The surname Otillio has its origins in Italy, tracing back to the medieval period. The name is derived from the Latin name Otilio, which itself is a diminutive form of the name Otho. Otho is believed to have been derived from the Old German name Audoin, meaning "wealthy" or "prosperous."
One of the earliest recorded instances of the name Otillio can be found in a 12th-century manuscript from the city of Siena, where a certain Otillio di Bartolomeo was mentioned as a landowner. In the same region, there is also a reference to a family from the village of Montepulciano, known as the Otillio della Vigna, who were prominent winemakers in the 13th century.
The name Otillio is closely associated with the town of Orvieto, located in the province of Terni, Umbria. Historical records indicate that the Otillio family played a significant role in the town's history, with several members serving as magistrates and civic leaders throughout the 14th and 15th centuries. Among the most notable figures was Giovanni Otillio (1375-1443), who served as the mayor of Orvieto for several terms and was instrumental in the construction of the town's famous cathedral.
Another prominent individual bearing the surname Otillio was Giulio Otillio (1524-1598), a renowned architect and sculptor from Florence. He was commissioned to design several churches and palaces in cities across Italy, including the Palazzo Otillio in his hometown, which still stands today as a testament to his architectural prowess.
In the realm of literature, the name Otillio is associated with the 16th-century poet and playwright, Pietro Otillio (1510-1580). Born in Naples, he was known for his comedic works and satires, which often satirized the societal norms and political climate of his time.
The surname Otillio has also been traced to the island of Sardinia, where it is believed to have been introduced by Italian settlers during the medieval period. One notable figure from this region was Antonio Otillio (1670-1739), a renowned mathematician and astronomer who made significant contributions to the study of celestial mechanics.
Demographics
Ancestry and ethnicity for Otillio
Among Census respondents with the surname Otillio, the largest self-reported group is White at 93.5%. The next largest groups are Hispanic (4.7%) and Black (1.9%).
The bar chart below shows how Otillio 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 Otillio surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.5% · 100
- Hispanic or Latino4.7% · 5
- Black or African American1.9% · 2
Timeline
Historical Census data for Otillio
Otillio 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
#151,639
National surname rank
Recorded bearers 107
-5 bearers (-4.5%)
Per 100,000 0.04
Rank movement Down 4,386 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #147,253 | 112 | 0.04 | First available Census row | First available Census row |
| 2020 | #151,639 | 107 | 0.04 | -5 bearers (-4.5%) | Down 4,386 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 Otillio 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 | #151,639 | -3.0% |
| Count | 112 | 107 | -4.5% |
| Per 100K | 0.04 | 0.04 | -10.5% |
Between the 2010 and 2020 Census, the number of Otillio bearers went from 112 to 107 (-4.5% change). The surname moved down 4,386 positions in the national ranking, going from #147,253 to #151,639.
FAQ
Otillio surname: questions and answers
How many people in the U.S. have the surname Otillio?
Name Census estimates that about 123 living Americans carry the surname Otillio. Using the current population baseline, that works out to roughly 1 in 2,786,621 residents.
How common is Otillio?
Otillio ranks #151,639 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 107 people with the surname Otillio. That is different from the site's living-bearer estimate (123), 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 Otillio.
Has Otillio become more or less common over time?
Between 2010 and 2020, the surname Otillio went from 112 recorded bearers to 107. That is a decrease of 5 (-4.5%). In the national ranking it fell from #147,253 to #151,639.
What does the Census say about the background of Otillio?
Among Census respondents with the surname Otillio, the largest self-reported group is White at 93.5%. The next largest groups are Hispanic (4.7%) and Black (1.9%). 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 Otillio in the 2020 Census, accounting for 93.5% (100 people in the source table).
What is the full ancestry breakdown?
Otillio appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.5%), Hispanic (4.7%), Black (1.9%). 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 Otillio (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 Otillio mean?
A surname derived from the Germanic name Odilo, meaning "wealthy heir". 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 Otillio (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 Americans have the surname Otillio?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.