2000
#148,244
National surname rank
Recorded bearers 102
First available Census row
Per 100,000 0.04
Very Rare Last name
Delfiacco
An Italian surname originating from "del fiacco", meaning "of the weak one".
According to the 2020 US Census Bureau surname tables, roughly 126 Americans carry the last name Delfiacco. That puts it at #149,446 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,720,273 residents).
This page is the full Name Census profile for the Delfiacco 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
126
1 in 2,720,273
Census rank
#149,446
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
110
very rare in the US
Popularity narrative
The Census Bureau recorded 110 bearers of the surname Delfiacco in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 149446th position in the national surname ranking.
Among Census respondents with the surname Delfiacco, the largest self-reported group is White at 96.4%. The next largest groups are Hispanic (2.7%) and American Indian/Alaska Native (0.9%).
Origin
Meaning and origin of Delfiacco
The surname DELFIACCO is believed to have originated in Italy, specifically in the region of Veneto. It likely emerged during the medieval period, between the 11th and 15th centuries. The name is thought to be derived from the Italian words "del" meaning "from" and "fiacco" meaning "weak" or "feeble." This suggests that the name may have been given as a descriptive nickname to someone who was physically weak or had a slight build.
One of the earliest recorded references to the DELFIACCO name can be found in a 14th-century document from the city of Padua, which mentions a person named Giovanni Delfiacco. Another early example is a 15th-century record from the town of Vicenza, where a certain Matteo Delfiacco is listed as a landowner.
In the 16th century, the DELFIACCO surname appears in the records of the Venetian Republic, indicating that members of this family may have held positions of some importance within the Republic's administrative or mercantile structures. One notable individual was Marco Delfiacco, a merchant from Venice who was born in 1523 and is mentioned in chronicles of the time for his trading ventures in the eastern Mediterranean.
The name DELFIACCO can also be found in historical documents from the nearby regions of Friuli-Venezia Giulia and Trentino-Alto Adige, suggesting that the family may have had branches or offshoots in these areas as well. In the 18th century, a man named Antonio Delfiacco, born in 1712 in the town of Codroipo (Friuli-Venezia Giulia), gained recognition as a skilled sculptor and woodcarver.
Another individual of note was Giovanni Battista Delfiacco, a 19th-century painter from the town of Riva del Garda (Trentino-Alto Adige), who was born in 1825 and is known for his landscape paintings depicting the scenic beauty of the Italian Alps.
Throughout its history, the DELFIACCO surname has been associated with various professions and occupations, including merchants, artisans, and intellectuals, reflecting the diverse backgrounds and contributions of those who bore this name.
Demographics
Ancestry and ethnicity for Delfiacco
Among Census respondents with the surname Delfiacco, the largest self-reported group is White at 96.4%. The next largest groups are Hispanic (2.7%) and American Indian/Alaska Native (0.9%).
The bar chart below shows how Delfiacco 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 Delfiacco surname at the time of the 2020 Census, not any inherent property of the name itself.
- White96.4% · 106
- Hispanic or Latino2.7% · 3
- American Indian and Alaska Native0.9% · 1
Timeline
Historical Census data for Delfiacco
Delfiacco 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
#152,628
National surname rank
Recorded bearers 107
+5 bearers (+4.9%)
Per 100,000 0.04
Rank movement Down 4,384 places
2020
#149,446
National surname rank
Recorded bearers 110
+3 bearers (+2.8%)
Per 100,000 0.04
Rank movement Up 3,182 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #148,244 | 102 | 0.04 | First available Census row | First available Census row |
| 2010 | #152,628 | 107 | 0.04 | +5 bearers (+4.9%) | Down 4,384 places |
| 2020 | #149,446 | 110 | 0.04 | +3 bearers (+2.8%) | Up 3,182 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 Delfiacco 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 | #152,628 | #149,446 | 2.1% |
| Count | 107 | 110 | 2.8% |
| Per 100K | 0.04 | 0.04 | -8.0% |
Between the 2010 and 2020 Census, the number of Delfiacco bearers went from 107 to 110 (+2.8% change). The surname moved up 3,182 positions in the national ranking, going from #152,628 to #149,446.
FAQ
Delfiacco surname: questions and answers
How many people in the U.S. have the surname Delfiacco?
Name Census estimates that about 126 living Americans carry the surname Delfiacco. Using the current population baseline, that works out to roughly 1 in 2,720,273 residents.
How common is Delfiacco?
Delfiacco ranks #149,446 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 110 people with the surname Delfiacco. That is different from the site's living-bearer estimate (126), 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 Delfiacco.
Has Delfiacco become more or less common over time?
Between 2010 and 2020, the surname Delfiacco went from 107 recorded bearers to 110. That is an increase of 3 (+2.8%). In the national ranking it rose from #152,628 to #149,446.
What does the Census say about the background of Delfiacco?
Among Census respondents with the surname Delfiacco, the largest self-reported group is White at 96.4%. The next largest groups are Hispanic (2.7%) and American Indian/Alaska Native (0.9%). 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 Delfiacco in the 2020 Census, accounting for 96.4% (106 people in the source table).
What is the full ancestry breakdown?
Delfiacco appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (96.4%), Hispanic (2.7%), American Indian/Alaska Native (0.9%). 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 Delfiacco (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 Delfiacco mean?
An Italian surname originating from "del fiacco", meaning "of the weak one". 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 Delfiacco (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 people share the surname Delfiacco?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.