2000
#7,878
National surname rank
Recorded bearers 3,898
First available Census row
Per 100,000 1.44
Rare Last name
Digiacomo
An Italian surname referring to someone from the Giacomo family or descended from someone named Giacomo.
According to the 2020 US Census Bureau surname tables, roughly 4,355 Americans carry the last name Digiacomo. That puts it at #8,347 in the national surname ranking, appearing at a frequency of 1.27 per 100,000 people (about 1 in 78,704 residents).
This page is the full Name Census profile for the Digiacomo 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
4.4K
1 in 78,704
Census rank
#8,347
2020 decennial data
Per 100,000
1.3
Frequency rate
Recorded bearers
3.8K
rare in the US
Popularity narrative
The Census Bureau recorded 3,798 bearers of the surname Digiacomo in its 2020 decennial surname file. At a rate of 1.27 per 100,000 residents, it holds the 8347th position in the national surname ranking.
Among Census respondents with the surname Digiacomo, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (5.6%) and Two or More Races (1.8%).
Origin
Meaning and origin of Digiacomo
The surname DiGiacomo has its origins in Italy, dating back to the late Middle Ages. It is derived from the Italian given name Giacomo, which is the Italian equivalent of the name James. The prefix "Di" in Italian means "of" or "from," indicating that the name likely referred to someone who was the son of Giacomo or hailed from a place associated with that name.
The name can be traced back to various regions of Italy, including Sicily, Calabria, and Campania. In some areas, the name was also spelled as DeGiacomo or DeJacomo, reflecting local dialects and variations in pronunciation.
Historical records from the 13th and 14th centuries suggest that the name was present in various parts of Italy. For instance, there are mentions of individuals with the surname DiGiacomo in the registries of the Republic of Venice and the Kingdom of Naples.
One of the earliest recorded examples of the name dates back to the late 14th century, when a certain Giovanni DiGiacomo was mentioned in a document from the city of Palermo, Sicily. Another notable figure was Tommaso DiGiacomo, a merchant from Naples who lived in the 15th century and was involved in the trade between Italy and the Levant.
In the 16th century, the name appeared in the records of the Papal States, with a certain Pietro DiGiacomo serving as a scribe in the Vatican Library. During the same period, a family of DiGiacomos was documented in the town of Amalfi, where they were involved in the maritime trade.
The 17th century saw the rise of a prominent DiGiacomo family in the city of Messina, Sicily. One of its members, Domenico DiGiacomo (1620-1697), was a renowned architect and engineer who contributed to the reconstruction of the city after the devastating earthquake of 1693.
Another notable figure was Antonio DiGiacomo (1745-1819), a lawyer and politician from Naples who played a role in the Neapolitan Republic of 1799 and later served as a judge during the Napoleonic era.
In the 19th century, the name gained prominence in the region of Calabria, where a family of DiGiacomos owned extensive lands and vineyards. One of their descendants, Giuseppe DiGiacomo (1867-1932), was a renowned winemaker and philanthropist who helped establish several schools and hospitals in the area.
Demographics
Ancestry and ethnicity for Digiacomo
Among Census respondents with the surname Digiacomo, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (5.6%) and Two or More Races (1.8%).
The bar chart below shows how Digiacomo 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 Digiacomo surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.3% · 3,467
- Hispanic or Latino5.6% · 213
- Two or more races1.8% · 70
- Asian and Pacific Islander0.8% · 29
- Black or African American0.4% · 15
- American Indian and Alaska Native0.1% · 4
Timeline
Historical Census data for Digiacomo
Digiacomo 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
#8,189
National surname rank
Recorded bearers 4,051
+153 bearers (+3.9%)
Per 100,000 1.37
Rank movement Down 311 places
2020
#8,347
National surname rank
Recorded bearers 3,798
-253 bearers (-6.2%)
Per 100,000 1.27
Rank movement Down 158 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #7,878 | 3,898 | 1.44 | First available Census row | First available Census row |
| 2010 | #8,189 | 4,051 | 1.37 | +153 bearers (+3.9%) | Down 311 places |
| 2020 | #8,347 | 3,798 | 1.27 | -253 bearers (-6.2%) | Down 158 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 Digiacomo 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 | #8,189 | #8,347 | -1.9% |
| Count | 4,051 | 3,798 | -6.2% |
| Per 100K | 1.37 | 1.27 | -7.3% |
Between the 2010 and 2020 Census, the number of Digiacomo bearers went from 4,051 to 3,798 (-6.2% change). The surname moved down 158 positions in the national ranking, going from #8,189 to #8,347.
FAQ
Digiacomo surname: questions and answers
How many people in the U.S. have the surname Digiacomo?
Name Census estimates that about 4,355 living Americans carry the surname Digiacomo. Using the current population baseline, that works out to roughly 1 in 78,704 residents.
How common is Digiacomo?
Digiacomo ranks #8,347 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.27 per 100,000 residents, which is about 1 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 3,798 people with the surname Digiacomo. That is different from the site's living-bearer estimate (4,355), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.27 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.27 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 1 of them to have the surname Digiacomo.
Has Digiacomo become more or less common over time?
Between 2010 and 2020, the surname Digiacomo went from 4,051 recorded bearers to 3,798. That is a decrease of 253 (-6.2%). In the national ranking it fell from #8,189 to #8,347.
What does the Census say about the background of Digiacomo?
Among Census respondents with the surname Digiacomo, the largest self-reported group is White at 91.3%. The next largest groups are Hispanic (5.6%) 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 Digiacomo in the 2020 Census, accounting for 91.3% (3,467 people in the source table).
What is the full ancestry breakdown?
Digiacomo appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.3%), Hispanic (5.6%), 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 Digiacomo (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 Digiacomo mean?
An Italian surname referring to someone from the Giacomo family or descended from someone named Giacomo. 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 Digiacomo (1.27 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 Digiacomo?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.