2000
#5,407
National surname rank
Recorded bearers 5,928
First available Census row
Per 100,000 2.20
Rare Last name
Costanzo
An Italian surname derived from the Latin name Constantius, meaning "constant, steadfast."
According to the 2020 US Census Bureau surname tables, roughly 6,596 Americans carry the last name Costanzo. That puts it at #5,797 in the national surname ranking, appearing at a frequency of 1.92 per 100,000 people (about 1 in 51,964 residents).
This page is the full Name Census profile for the Costanzo 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
6.6K
1 in 51,964
Census rank
#5,797
2020 decennial data
Per 100,000
1.9
Frequency rate
Recorded bearers
5.8K
rare in the US
Popularity narrative
The Census Bureau recorded 5,752 bearers of the surname Costanzo in its 2020 decennial surname file. At a rate of 1.92 per 100,000 residents, it holds the 5797th position in the national surname ranking.
Among Census respondents with the surname Costanzo, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.6%) and Two or More Races (1.8%).
Origin
Meaning and origin of Costanzo
The surname Costanzo has its origins in Italy, traced back to the medieval period. It is derived from the Latin name "Constantius," which means "constant" or "steadfast." The name was popularized during the Roman Empire and later adopted as a personal name in Italy.
In the 11th century, the name Costanzo appeared in various Italian regions, including Sicily, Campania, and Calabria. One of the earliest recorded instances of the name can be found in a document from the Monastery of St. Michael the Archangel in Campania, dated 1078, mentioning a certain "Costanzo di Salerno."
The Costanzo surname gained prominence during the Renaissance period, with notable figures such as Costanzo Sforza (1447-1483), a renowned military leader from Milan. He played a significant role in the Italian Wars and was known for his bravery and strategic skills.
Another prominent individual with the Costanzo surname was Costanzo Festa (1485-1545), an Italian Renaissance painter and architect from Ferrara. He is best known for his fresco work in the Basilica of Santa Maria Assunta in Treviso, which he completed in the early 16th century.
In the 17th century, the name Costanzo was associated with the town of Costanzo in the province of Pescara, Abruzzo. This may have contributed to the further spread of the surname in the region.
During the 18th century, the Costanzo family established itself as a noble lineage in Naples. Costanzo di Capua (1714-1788) was a prominent Neapolitan nobleman and historian who wrote extensively about the history of Naples and its ruling dynasties.
Another notable figure was Costanzo Gaetano Orsini (1789-1856), an Italian cardinal and diplomat who served as the Apostolic Nuncio to Portugal and later as the Cardinal Secretary of State under Pope Gregory XVI.
Throughout history, the surname Costanzo has been associated with various professions, including military leaders, artists, writers, and members of the Catholic Church. Its enduring presence in Italy serves as a testament to the rich cultural heritage and historical significance of this surname.
Demographics
Ancestry and ethnicity for Costanzo
Among Census respondents with the surname Costanzo, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.6%) and Two or More Races (1.8%).
The bar chart below shows how Costanzo 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 Costanzo surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.2% · 5,301
- Hispanic or Latino4.6% · 267
- Two or more races1.8% · 105
- Asian and Pacific Islander0.8% · 48
- Black or African American0.5% · 29
- American Indian and Alaska Native0.0% · 2
Timeline
Historical Census data for Costanzo
Costanzo 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
#5,794
National surname rank
Recorded bearers 5,970
+42 bearers (+0.7%)
Per 100,000 2.02
Rank movement Down 387 places
2020
#5,797
National surname rank
Recorded bearers 5,752
-218 bearers (-3.7%)
Per 100,000 1.92
Rank movement Down 3 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #5,407 | 5,928 | 2.20 | First available Census row | First available Census row |
| 2010 | #5,794 | 5,970 | 2.02 | +42 bearers (+0.7%) | Down 387 places |
| 2020 | #5,797 | 5,752 | 1.92 | -218 bearers (-3.7%) | Down 3 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 Costanzo 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 | #5,794 | #5,797 | -0.1% |
| Count | 5,970 | 5,752 | -3.7% |
| Per 100K | 2.02 | 1.92 | -4.7% |
Between the 2010 and 2020 Census, the number of Costanzo bearers went from 5,970 to 5,752 (-3.7% change). The surname moved down 3 positions in the national ranking, going from #5,794 to #5,797.
FAQ
Costanzo surname: questions and answers
How many people in the U.S. have the surname Costanzo?
Name Census estimates that about 6,596 living Americans carry the surname Costanzo. Using the current population baseline, that works out to roughly 1 in 51,964 residents.
How common is Costanzo?
Costanzo ranks #5,797 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.92 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 5,752 people with the surname Costanzo. That is different from the site's living-bearer estimate (6,596), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.92 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.92 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 Costanzo.
Has Costanzo become more or less common over time?
Between 2010 and 2020, the surname Costanzo went from 5,970 recorded bearers to 5,752. That is a decrease of 218 (-3.7%). In the national ranking it fell from #5,794 to #5,797.
What does the Census say about the background of Costanzo?
Among Census respondents with the surname Costanzo, the largest self-reported group is White at 92.2%. The next largest groups are Hispanic (4.6%) and Two or More Races (1.8%). 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 Costanzo in the 2020 Census, accounting for 92.2% (5,301 people in the source table).
What is the full ancestry breakdown?
Costanzo appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.2%), Hispanic (4.6%), Two or More Races (1.8%). 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 Costanzo (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 Costanzo mean?
An Italian surname derived from the Latin name Constantius, meaning "constant, steadfast." 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 Costanzo (1.92 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 have the last name Costanzo?
See how common the surname Costanzo is on HowManyOfMe.org, our sister site built around that single question.