2000
#146,011
National surname rank
Recorded bearers 104
First available Census row
Per 100,000 0.04
Very Rare Last name
Dematto
Originally from Italian roots, a surname indicating familial origins or residency in a place named Matto or a derivative.
According to the 2020 US Census Bureau surname tables, roughly 115 Americans carry the last name Dematto. That puts it at #155,682 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,980,473 residents).
This page is the full Name Census profile for the Dematto 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
115
1 in 2,980,473
Census rank
#155,682
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
100
very rare in the US
Popularity narrative
The Census Bureau recorded 100 bearers of the surname Dematto in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 155682nd position in the national surname ranking.
Among Census respondents with the surname Dematto, the largest self-reported group is White at 90.0%. The next largest groups are Hispanic (8.0%) and American Indian/Alaska Native (1.0%).
Origin
Meaning and origin of Dematto
The surname DEMATTO originated in Italy, specifically in the region of Lombardy, during the Middle Ages. It is believed to be derived from the Italian word "matto," which means "crazy" or "foolish." The prefix "de" likely indicates a place of origin or a familial relationship.
The earliest known recorded instance of the name DEMATTO dates back to the 14th century, where it appeared in a historical document from the city of Cremona. This document referenced a certain "Giovanni DEMATTO," who was a merchant and landowner in the area.
In the 15th century, the name DEMATTO was also found in records from the city of Milan, where a family bearing this surname was involved in the textile trade. It is possible that the name originated as a nickname or a reference to a particular ancestor who was known for their eccentric or unconventional behavior.
One of the earliest notable individuals with the surname DEMATTO was Antonio DEMATTO (1520-1588), a renowned painter from the town of Treviglio. His works can be found in various churches and museums throughout northern Italy.
Another prominent figure was Girolamo DEMATTO (1632-1701), a Baroque composer and organist from the city of Cremona. He is best known for his sacred choral works and organ compositions, which were highly regarded during his lifetime.
In the 18th century, a branch of the DEMATTO family migrated to the island of Sicily, where they established themselves as landowners and winemakers. One of their descendants, Francesco DEMATTO (1785-1856), was a respected vintner and philanthropist who donated a significant portion of his wealth to local charitable causes.
During the 19th century, the name DEMATTO was also found in various regions of northern Italy, including Piedmont and Veneto. Notably, Alessandro DEMATTO (1826-1892) was a prominent lawyer and political activist from Turin, who played a role in the unification of Italy and the establishment of the new Italian state.
Another notable figure from this period was Marcella DEMATTO (1848-1924), a renowned educator and women's rights advocate from the city of Verona. She founded several schools for girls and worked tirelessly to promote equal educational opportunities for women in Italy.
Demographics
Ancestry and ethnicity for Dematto
Among Census respondents with the surname Dematto, the largest self-reported group is White at 90.0%. The next largest groups are Hispanic (8.0%) and American Indian/Alaska Native (1.0%).
The bar chart below shows how Dematto 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 Dematto surname at the time of the 2020 Census, not any inherent property of the name itself.
- White90.0% · 90
- Hispanic or Latino8.0% · 8
- American Indian and Alaska Native1.0% · 1
- Two or more races1.0% · 1
Timeline
Historical Census data for Dematto
Dematto 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
#147,253
National surname rank
Recorded bearers 112
+8 bearers (+7.7%)
Per 100,000 0.04
Rank movement Down 1,242 places
2020
#155,682
National surname rank
Recorded bearers 100
-12 bearers (-10.7%)
Per 100,000 0.03
Rank movement Down 8,429 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #146,011 | 104 | 0.04 | First available Census row | First available Census row |
| 2010 | #147,253 | 112 | 0.04 | +8 bearers (+7.7%) | Down 1,242 places |
| 2020 | #155,682 | 100 | 0.03 | -12 bearers (-10.7%) | Down 8,429 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 Dematto 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 | #147,253 | #155,682 | -5.7% |
| Count | 112 | 100 | -10.7% |
| Per 100K | 0.04 | 0.03 | -16.4% |
Between the 2010 and 2020 Census, the number of Dematto bearers went from 112 to 100 (-10.7% change). The surname moved down 8,429 positions in the national ranking, going from #147,253 to #155,682.
FAQ
Dematto surname: questions and answers
How many people in the U.S. have the surname Dematto?
Name Census estimates that about 115 living Americans carry the surname Dematto. Using the current population baseline, that works out to roughly 1 in 2,980,473 residents.
How common is Dematto?
Dematto ranks #155,682 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.03 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 100 people with the surname Dematto. That is different from the site's living-bearer estimate (115), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.03 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.03 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 Dematto.
Has Dematto become more or less common over time?
Between 2010 and 2020, the surname Dematto went from 112 recorded bearers to 100. That is a decrease of 12 (-10.7%). In the national ranking it fell from #147,253 to #155,682.
What does the Census say about the background of Dematto?
Among Census respondents with the surname Dematto, the largest self-reported group is White at 90.0%. The next largest groups are Hispanic (8.0%) and American Indian/Alaska Native (1.0%). 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 Dematto in the 2020 Census, accounting for 90.0% (90 people in the source table).
What is the full ancestry breakdown?
Dematto appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (90.0%), Hispanic (8.0%), American Indian/Alaska Native (1.0%). 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 Dematto (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 Dematto mean?
Originally from Italian roots, a surname indicating familial origins or residency in a place named Matto or a derivative. 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 Dematto (0.03 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 Dematto?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.