2000
#141,788
National surname rank
Recorded bearers 108
First available Census row
Per 100,000 0.04
Very Rare Last name
Tomasiello
An Italian surname derived from the given name Tommaso, the Italian form of Thomas.
According to the 2020 US Census Bureau surname tables, roughly 117 Americans carry the last name Tomasiello. That puts it at #154,755 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,929,524 residents).
This page is the full Name Census profile for the Tomasiello 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
117
1 in 2,929,524
Census rank
#154,755
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
102
very rare in the US
Popularity narrative
The Census Bureau recorded 102 bearers of the surname Tomasiello in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 154755th position in the national surname ranking.
Among Census respondents with the surname Tomasiello, the largest self-reported group is White at 87.3%. The next largest groups are Hispanic (9.8%) and Asian/Pacific Islander (1.0%).
Origin
Meaning and origin of Tomasiello
The surname Tomasiello is of Italian origin, originating from the regions of Campania and Basilicata in southern Italy. It is derived from the Italian personal name Tommaso, which itself is derived from the Aramaic name Thomas, meaning "twin."
The earliest recorded instances of the surname Tomasiello date back to the 16th century in various Italian records and documents. One notable early bearer of the name was Giovanni Tomasiello, a scholar and philosopher from Naples who lived from 1548 to 1622.
Tomasiello is believed to have been an occupational surname, initially referring to someone who worked as a servant or attendant for a person named Tommaso. Over time, it became a hereditary surname passed down through generations.
In the 17th century, records show a Nicola Tomasiello who was a notable painter and sculptor from the town of Gravina in Puglia, born in 1635 and active until his death in 1698.
Another notable bearer of the surname was Francesco Tomasiello, a lawyer and judge from Avellino, Campania, who lived from 1725 to 1798 and served as a magistrate in the Kingdom of Naples.
During the 19th century, the Tomasiello surname spread beyond Italy as a result of Italian emigration. One notable figure from this period was Giuseppe Tomasiello, an Italian-American writer and journalist born in Naples in 1853 and active in New York City until his death in 1921.
In more recent times, Gaetano Tomasiello was an Italian mathematician and physicist who made significant contributions to the study of differential equations and lived from 1897 to 1968.
While the surname Tomasiello is not as common outside of Italy today, it has a rich historical legacy, particularly in the regions of southern Italy where it originated and was most prevalent.
Demographics
Ancestry and ethnicity for Tomasiello
Among Census respondents with the surname Tomasiello, the largest self-reported group is White at 87.3%. The next largest groups are Hispanic (9.8%) and Asian/Pacific Islander (1.0%).
The bar chart below shows how Tomasiello 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 Tomasiello surname at the time of the 2020 Census, not any inherent property of the name itself.
- White87.3% · 89
- Hispanic or Latino9.8% · 10
- Asian and Pacific Islander1.0% · 1
- American Indian and Alaska Native1.0% · 1
- Two or more races1.0% · 1
Timeline
Historical Census data for Tomasiello
Tomasiello 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
#146,201
National surname rank
Recorded bearers 113
+5 bearers (+4.6%)
Per 100,000 0.04
Rank movement Down 4,413 places
2020
#154,755
National surname rank
Recorded bearers 102
-11 bearers (-9.7%)
Per 100,000 0.03
Rank movement Down 8,554 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #141,788 | 108 | 0.04 | First available Census row | First available Census row |
| 2010 | #146,201 | 113 | 0.04 | +5 bearers (+4.6%) | Down 4,413 places |
| 2020 | #154,755 | 102 | 0.03 | -11 bearers (-9.7%) | Down 8,554 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 Tomasiello 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 | #146,201 | #154,755 | -5.9% |
| Count | 113 | 102 | -9.7% |
| Per 100K | 0.04 | 0.03 | -14.7% |
Between the 2010 and 2020 Census, the number of Tomasiello bearers went from 113 to 102 (-9.7% change). The surname moved down 8,554 positions in the national ranking, going from #146,201 to #154,755.
FAQ
Tomasiello surname: questions and answers
How many people in the U.S. have the surname Tomasiello?
Name Census estimates that about 117 living Americans carry the surname Tomasiello. Using the current population baseline, that works out to roughly 1 in 2,929,524 residents.
How common is Tomasiello?
Tomasiello ranks #154,755 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 102 people with the surname Tomasiello. That is different from the site's living-bearer estimate (117), 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 Tomasiello.
Has Tomasiello become more or less common over time?
Between 2010 and 2020, the surname Tomasiello went from 113 recorded bearers to 102. That is a decrease of 11 (-9.7%). In the national ranking it fell from #146,201 to #154,755.
What does the Census say about the background of Tomasiello?
Among Census respondents with the surname Tomasiello, the largest self-reported group is White at 87.3%. The next largest groups are Hispanic (9.8%) and Asian/Pacific Islander (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 Tomasiello in the 2020 Census, accounting for 87.3% (89 people in the source table).
What is the full ancestry breakdown?
Tomasiello appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (87.3%), Hispanic (9.8%), Asian/Pacific Islander (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 Tomasiello (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 Tomasiello mean?
An Italian surname derived from the given name Tommaso, the Italian form of Thomas. 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 Tomasiello (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 last name Tomasiello?
Find out how many people are called Tomasiello on our sister site HowManyOfMe.org — a quick modern estimate with the living-bearer count front and centre.