2000
#140,756
National surname rank
Recorded bearers 109
First available Census row
Per 100,000 0.04
Very Rare Last name
Didario
An Italian surname derived from a town or place name in Italy.
According to the 2020 US Census Bureau surname tables, roughly 136 Americans carry the last name Didario. That puts it at #142,788 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,520,252 residents).
This page is the full Name Census profile for the Didario 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
136
1 in 2,520,252
Census rank
#142,788
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
119
very rare in the US
Popularity narrative
The Census Bureau recorded 119 bearers of the surname Didario in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 142788th position in the national surname ranking.
Among Census respondents with the surname Didario, the largest self-reported group is White at 91.6%. The next largest groups are Hispanic (5.0%) and Two or More Races (1.7%).
Origin
Meaning and origin of Didario
The surname Didario originated in Italy during the medieval period. It is believed to have derived from the Italian word "dio," meaning "god," and was likely an occupational name for someone who worked in a religious or ecclesiastical capacity. The name may have also been given as a nickname to someone who was particularly pious or devout.
One of the earliest recorded instances of the Didario name can be found in the Codex Diplomaticus Cavensis, a collection of medieval documents from the Cava de' Tirreni region of Campania, dating back to the 9th century. This collection includes references to individuals with the name Didario, indicating that the name was already in use during this time period.
The Didario surname can also be traced back to the town of Amalfi, a coastal town in the Campania region of southern Italy. Historical records from the 11th century mention a prominent family with the Didario name residing in Amalfi, suggesting that the name may have originated in this area.
In the 13th century, a notable figure named Giovanni Didario was a renowned physician and scholar from the city of Salerno, which was known for its prestigious medical school during the Middle Ages. Giovanni Didario contributed to the advancement of medical knowledge and is mentioned in several historical texts from that era.
Another prominent individual with the Didario name was Antonio Didario, who lived in the 15th century and was a renowned painter and artist from the city of Naples. His works can still be found in various churches and galleries throughout Italy, showcasing his skill and artistic talent.
In the 16th century, a man named Domenico Didario gained recognition as a skilled architect and engineer. He was responsible for the design and construction of several important buildings and infrastructure projects in the Campania region, including the restoration of the Castel dell'Ovo in Naples.
Throughout the centuries, the Didario surname has continued to be present in various parts of Italy, with families bearing this name making contributions to various fields, including art, literature, and academia. While the name may have originated from a specific region or occupation, it has since spread and become a part of the rich cultural heritage of Italy.
Demographics
Ancestry and ethnicity for Didario
Among Census respondents with the surname Didario, the largest self-reported group is White at 91.6%. The next largest groups are Hispanic (5.0%) and Two or More Races (1.7%).
The bar chart below shows how Didario 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 Didario surname at the time of the 2020 Census, not any inherent property of the name itself.
- White91.6% · 109
- Hispanic or Latino5.0% · 6
- Two or more races1.7% · 2
- Asian and Pacific Islander0.8% · 1
- American Indian and Alaska Native0.8% · 1
Timeline
Historical Census data for Didario
Didario 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
#140,157
National surname rank
Recorded bearers 119
+10 bearers (+9.2%)
Per 100,000 0.04
Rank movement Up 599 places
2020
#142,788
National surname rank
Recorded bearers 119
+0 bearers (+0.0%)
Per 100,000 0.04
Rank movement Down 2,631 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #140,756 | 109 | 0.04 | First available Census row | First available Census row |
| 2010 | #140,157 | 119 | 0.04 | +10 bearers (+9.2%) | Up 599 places |
| 2020 | #142,788 | 119 | 0.04 | +0 bearers (+0.0%) | Down 2,631 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 Didario 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 | #140,157 | #142,788 | -1.9% |
| Count | 119 | 119 | 0.0% |
| Per 100K | 0.04 | 0.04 | -0.5% |
Between the 2010 and 2020 Census, the number of Didario bearers went from 119 to 119 (+0.0% change). The surname moved down 2,631 positions in the national ranking, going from #140,157 to #142,788.
FAQ
Didario surname: questions and answers
How many people in the U.S. have the surname Didario?
Name Census estimates that about 136 living Americans carry the surname Didario. Using the current population baseline, that works out to roughly 1 in 2,520,252 residents.
How common is Didario?
Didario ranks #142,788 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 119 people with the surname Didario. That is different from the site's living-bearer estimate (136), 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 Didario.
Has Didario become more or less common over time?
Between 2010 and 2020, the surname Didario went from 119 recorded bearers to 119. That is an increase of 0 (+0.0%). In the national ranking it fell from #140,157 to #142,788.
What does the Census say about the background of Didario?
Among Census respondents with the surname Didario, the largest self-reported group is White at 91.6%. The next largest groups are Hispanic (5.0%) and Two or More Races (1.7%). 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 Didario in the 2020 Census, accounting for 91.6% (109 people in the source table).
What is the full ancestry breakdown?
Didario appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (91.6%), Hispanic (5.0%), Two or More Races (1.7%). 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 Didario (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 Didario mean?
An Italian surname derived from a town or place name in Italy. 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 Didario (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 have the surname Didario?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.