2000
#7,607
National surname rank
Recorded bearers 4,030
First available Census row
Per 100,000 1.49
Rare Last name
Casiano
Derived from the Latin name Cassianus, meaning "hollow" or "empty," likely referring to someone who lived near a ravine or valley.
According to the 2020 US Census Bureau surname tables, roughly 6,002 Americans carry the last name Casiano. That puts it at #6,259 in the national surname ranking, appearing at a frequency of 1.75 per 100,000 people (about 1 in 57,107 residents).
This page is the full Name Census profile for the Casiano 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
6.0K
1 in 57,107
Census rank
#6,259
2020 decennial data
Per 100,000
1.8
Frequency rate
Recorded bearers
5.2K
rare in the US
Popularity narrative
The Census Bureau recorded 5,234 bearers of the surname Casiano in its 2020 decennial surname file. At a rate of 1.75 per 100,000 residents, it holds the 6259th position in the national surname ranking.
Among Census respondents with the surname Casiano, the largest self-reported group is Hispanic at 85.7%. The next largest groups are White (7.8%) and Asian/Pacific Islander (4.3%).
Origin
Meaning and origin of Casiano
The surname Casiano is believed to have originated in Italy during the Middle Ages. It is derived from the Latin name "Casianus" or "Cassianus," which was a Roman family name. The name likely has its roots in the Latin word "cassis," meaning helmet, suggesting a possible link to military or warrior origins.
In the Middle Ages, the name Casiano was prevalent in various regions of Italy, particularly in the central and southern parts of the country. It can be found in ancient records and manuscripts from places like Rome, Naples, and Abruzzo.
One of the earliest recorded instances of the name Casiano is in the Codex Diplomaticus Cavensis, a collection of medieval documents from the Archivio della Badia di Cava dei Tirreni in Campania, Italy. The codex mentions a certain "Petrus Casianus" in a document dated 1093.
Another notable historical reference is Giovanni Battista Casiano, an Italian painter and architect who lived from 1570 to 1647. He was born in Ravenna and is known for his work in churches and palaces throughout Italy.
In the 15th century, the name Casiano was also found in the town of Casiano d'Asti, located in the province of Asti in the Piedmont region of Italy. This place name suggests a connection between the surname and a specific geographic location.
Other notable individuals with the surname Casiano include:
1. Pietro Casiano (1472-1537), an Italian philosopher and scholar from Siena.
2. Vincenzo Casiano (1624-1692), an Italian painter from Naples.
3. Girolamo Casiano (1598-1668), an Italian architect and engineer from Rome.
4. Antonio Casiano (1539-1611), an Italian composer and musician from Naples.
5. Giulio Casiano (1556-1620), an Italian jurist and legal scholar from Verona.
The surname Casiano has undergone various spelling variations over time, including Casiano, Cassiano, and Cassiani, among others. These variations reflect the linguistic evolution and regional influences on the name throughout its history.
Demographics
Ancestry and ethnicity for Casiano
Among Census respondents with the surname Casiano, the largest self-reported group is Hispanic at 85.7%. The next largest groups are White (7.8%) and Asian/Pacific Islander (4.3%).
The bar chart below shows how Casiano 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 Casiano surname at the time of the 2020 Census, not any inherent property of the name itself.
- Hispanic or Latino85.7% · 4,485
- White7.8% · 408
- Asian and Pacific Islander4.3% · 227
- Black or African American1.2% · 65
- Two or more races0.7% · 35
- American Indian and Alaska Native0.3% · 14
Timeline
Historical Census data for Casiano
Casiano 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
#6,349
National surname rank
Recorded bearers 5,369
+1,339 bearers (+33.2%)
Per 100,000 1.82
Rank movement Up 1,258 places
2020
#6,259
National surname rank
Recorded bearers 5,234
-135 bearers (-2.5%)
Per 100,000 1.75
Rank movement Up 90 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #7,607 | 4,030 | 1.49 | First available Census row | First available Census row |
| 2010 | #6,349 | 5,369 | 1.82 | +1,339 bearers (+33.2%) | Up 1,258 places |
| 2020 | #6,259 | 5,234 | 1.75 | -135 bearers (-2.5%) | Up 90 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 Casiano 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 | #6,349 | #6,259 | 1.4% |
| Count | 5,369 | 5,234 | -2.5% |
| Per 100K | 1.82 | 1.75 | -3.8% |
Between the 2010 and 2020 Census, the number of Casiano bearers went from 5,369 to 5,234 (-2.5% change). The surname moved up 90 positions in the national ranking, going from #6,349 to #6,259.
FAQ
Casiano surname: questions and answers
How many people in the U.S. have the surname Casiano?
Name Census estimates that about 6,002 living Americans carry the surname Casiano. Using the current population baseline, that works out to roughly 1 in 57,107 residents.
How common is Casiano?
Casiano ranks #6,259 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.75 per 100,000 residents, which is about 2 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 5,234 people with the surname Casiano. That is different from the site's living-bearer estimate (6,002), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.75 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.75 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 2 of them to have the surname Casiano.
Has Casiano become more or less common over time?
Between 2010 and 2020, the surname Casiano went from 5,369 recorded bearers to 5,234. That is a decrease of 135 (-2.5%). In the national ranking it rose from #6,349 to #6,259.
What does the Census say about the background of Casiano?
Among Census respondents with the surname Casiano, the largest self-reported group is Hispanic at 85.7%. The next largest groups are White (7.8%) and Asian/Pacific Islander (4.3%). 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?
Hispanic is the largest self-reported group for the surname Casiano in the 2020 Census, accounting for 85.7% (4,485 people in the source table).
What is the full ancestry breakdown?
Casiano appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are Hispanic (85.7%), White (7.8%), Asian/Pacific Islander (4.3%). 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 Casiano (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 Casiano mean?
Derived from the Latin name Cassianus, meaning "hollow" or "empty," likely referring to someone who lived near a ravine or valley. 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 Casiano (1.75 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 Casiano?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.