2000
#22,304
National surname rank
Recorded bearers 1,078
First available Census row
Per 100,000 0.40
Rare Last name
Castiglia
An Italian and Spanish surname derived from the region of Castile in Spain.
According to the 2020 US Census Bureau surname tables, roughly 1,081 Americans carry the last name Castiglia. That puts it at #27,133 in the national surname ranking, appearing at a frequency of 0.32 per 100,000 people (about 1 in 317,072 residents).
This page is the full Name Census profile for the Castiglia 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
1.1K
1 in 317,072
Census rank
#27,133
2020 decennial data
Per 100,000
0.3
Frequency rate
Recorded bearers
943
rare in the US
Popularity narrative
The Census Bureau recorded 943 bearers of the surname Castiglia in its 2020 decennial surname file. At a rate of 0.32 per 100,000 residents, it holds the 27133rd position in the national surname ranking.
Among Census respondents with the surname Castiglia, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.9%) and Two or More Races (1.5%).
Origin
Meaning and origin of Castiglia
The surname Castiglia is of Italian origin, derived from the Italian word "Castiglia," which means "Castile." This suggests that the name likely originated in the region of Castile, a historic region located in central Spain. The name may have been adopted by Italians who had some connection or association with the region of Castile, perhaps through trade, travel, or military service.
The earliest recorded instances of the surname Castiglia can be traced back to the 13th century in various Italian regions, including Tuscany, Emilia-Romagna, and Lombardy. It is believed that the name was initially used to identify individuals who had either lived in or originated from the region of Castile.
One notable early reference to the surname Castiglia can be found in the historical records of the city of Siena, dating back to the late 13th century. These records mention a family with the surname Castiglia, which suggests that the name had already become established in the region by that time.
In the 14th century, the surname Castiglia appeared in various Italian manuscripts and documents, including the "Codice Diplomatico Dantesco," a collection of documents related to the life and works of the famous Italian poet Dante Alighieri. This suggests that individuals bearing the surname Castiglia may have been associated with the literary and cultural circles of that era.
Among the notable individuals with the surname Castiglia throughout history are:
1. Ferdinando Castiglia (1554-1629), an Italian composer and musician who served as the maestro di cappella at the Basilica of Santa Maria Maggiore in Rome.
2. Giambattista Castiglia (1776-1851), an Italian painter and architect who worked extensively in the Neoclassical style.
3. Gabriele Castiglia (1833-1909), an Italian writer and journalist who founded the newspaper "Il Piccolo" in Trieste.
4. Antonio Castiglia (1898-1977), an Italian politician and trade unionist who served as the President of the Italian General Confederation of Labor (CGIL) from 1949 to 1960.
5. Vincenzo Castiglia (1908-1989), an Italian sculptor and artist known for his works in bronze and terracotta, which often depicted religious and mythological themes.
It is important to note that the surname Castiglia may have been subject to variations in spelling over time, such as Castiglione, Castiglioni, or Castigliani, reflecting the regional dialects and linguistic influences of different parts of Italy.
Demographics
Ancestry and ethnicity for Castiglia
Among Census respondents with the surname Castiglia, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.9%) and Two or More Races (1.5%).
The bar chart below shows how Castiglia 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 Castiglia surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.2% · 869
- Hispanic or Latino4.9% · 46
- Two or more races1.5% · 14
- Black or African American0.6% · 6
- Asian and Pacific Islander0.6% · 6
- American Indian and Alaska Native0.2% · 2
Timeline
Historical Census data for Castiglia
Castiglia 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
#24,702
National surname rank
Recorded bearers 1,010
-68 bearers (-6.3%)
Per 100,000 0.34
Rank movement Down 2,398 places
2020
#27,133
National surname rank
Recorded bearers 943
-67 bearers (-6.6%)
Per 100,000 0.32
Rank movement Down 2,431 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #22,304 | 1,078 | 0.40 | First available Census row | First available Census row |
| 2010 | #24,702 | 1,010 | 0.34 | -68 bearers (-6.3%) | Down 2,398 places |
| 2020 | #27,133 | 943 | 0.32 | -67 bearers (-6.6%) | Down 2,431 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 Castiglia 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 | #24,702 | #27,133 | -9.8% |
| Count | 1,010 | 943 | -6.6% |
| Per 100K | 0.34 | 0.32 | -7.2% |
Between the 2010 and 2020 Census, the number of Castiglia bearers went from 1,010 to 943 (-6.6% change). The surname moved down 2,431 positions in the national ranking, going from #24,702 to #27,133.
FAQ
Castiglia surname: questions and answers
How many people in the U.S. have the surname Castiglia?
Name Census estimates that about 1,081 living Americans carry the surname Castiglia. Using the current population baseline, that works out to roughly 1 in 317,072 residents.
How common is Castiglia?
Castiglia ranks #27,133 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 0.32 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 943 people with the surname Castiglia. That is different from the site's living-bearer estimate (1,081), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.32 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.32 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 Castiglia.
Has Castiglia become more or less common over time?
Between 2010 and 2020, the surname Castiglia went from 1,010 recorded bearers to 943. That is a decrease of 67 (-6.6%). In the national ranking it fell from #24,702 to #27,133.
What does the Census say about the background of Castiglia?
Among Census respondents with the surname Castiglia, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.9%) and Two or More Races (1.5%). 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 Castiglia in the 2020 Census, accounting for 92.2% (869 people in the source table).
What is the full ancestry breakdown?
Castiglia appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.2%), Hispanic (4.9%), Two or More Races (1.5%). 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 Castiglia (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 Castiglia mean?
An Italian and Spanish surname derived from the region of Castile in Spain. 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 Castiglia (0.32 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 are called Castiglia?
Find out how common the surname Castiglia is on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.