2010
#159,712
National surname rank
Recorded bearers 101
First available Census row
Per 100,000 0.03
Very Rare Last name
Tomaszewicz
A Polish surname indicating an ancestor's relation to Thomas, the biblical apostle.
According to the 2020 US Census Bureau surname tables, roughly 126 Americans carry the last name Tomaszewicz. 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 Tomaszewicz 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 Tomaszewicz 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 Tomaszewicz, the largest self-reported group is White at 86.4%. The next largest groups are Hispanic (4.5%) and Asian/Pacific Islander (4.5%).
Origin
Meaning and origin of Tomaszewicz
The surname Tomaszewicz originates from Poland, tracing its roots back to the 12th century. It is a Polish patronymic surname derived from the personal name Tomasz, a Polish form of the biblical name Thomas, meaning "twin." The suffix "-ewicz" is a common Slavic patronymic ending, indicating "son of."
Tomaszewicz is believed to have first emerged in the regions of Masovia and Lesser Poland, where it was initially borne by the descendants of men named Tomasz. Early recordings of the name can be found in medieval Polish documents, such as the Liber Beneficiorum, a 15th-century registry of ecclesiastical benefices.
One of the earliest documented individuals with this surname was Jan Tomaszewicz, a merchant and landowner from Kraków, who lived in the late 15th century. Another notable bearer was Stanisław Tomaszewicz, a Polish noble and military commander who fought against the Swedish invasion during the Deluge (1655-1660).
In the 17th century, the name Tomaszewicz appeared in various historical records, including the Metryka Koronna, a collection of documents from the Polish Crown Chancery. During this period, several villages and estates bore the name Tomaszewice or Tomaszowice, derived from the surname itself.
Among the prominent figures with the surname Tomaszewicz was Józef Tomaszewicz (1781-1855), a Polish-Lithuanian writer, translator, and playwright. He is best known for his translations of works by Shakespeare and Molière into Polish.
Franciszek Tomaszewicz (1809-1887) was a Polish historian and archivist who made significant contributions to the study of Lithuanian history and culture. He authored several works on the history of the Grand Duchy of Lithuania and its relationship with Poland.
In the 20th century, Wacław Tomaszewicz (1901-1988) was a notable Polish architect and urban planner. He designed several important buildings in Warsaw, including the Palace of Culture and Science.
The surname Tomaszewicz has also been borne by individuals in other Slavic countries, such as Belarus and Ukraine, where it has undergone minor spelling variations due to linguistic differences. However, its core meaning and origin remain firmly rooted in the Polish language and culture.
Demographics
Ancestry and ethnicity for Tomaszewicz
Among Census respondents with the surname Tomaszewicz, the largest self-reported group is White at 86.4%. The next largest groups are Hispanic (4.5%) and Asian/Pacific Islander (4.5%).
The bar chart below shows how Tomaszewicz 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 Tomaszewicz surname at the time of the 2020 Census, not any inherent property of the name itself.
- White86.4% · 95
- Hispanic or Latino4.5% · 5
- Asian and Pacific Islander4.5% · 5
- Two or more races2.7% · 3
- Black or African American1.8% · 2
Timeline
Historical Census data for Tomaszewicz
Tomaszewicz appears in 2 published Census surname files: 2010, 2020. The cards below show how the name's rank and bearer count changed across each release.
2020
#149,446
National surname rank
Recorded bearers 110
+9 bearers (+8.9%)
Per 100,000 0.04
Rank movement Up 10,266 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #159,712 | 101 | 0.03 | First available Census row | First available Census row |
| 2020 | #149,446 | 110 | 0.04 | +9 bearers (+8.9%) | Up 10,266 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 Tomaszewicz 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 | #159,712 | #149,446 | 6.4% |
| Count | 101 | 110 | 8.9% |
| Per 100K | 0.03 | 0.04 | 22.7% |
Between the 2010 and 2020 Census, the number of Tomaszewicz bearers went from 101 to 110 (+8.9% change). The surname moved up 10,266 positions in the national ranking, going from #159,712 to #149,446.
FAQ
Tomaszewicz surname: questions and answers
How many people in the U.S. have the surname Tomaszewicz?
Name Census estimates that about 126 living Americans carry the surname Tomaszewicz. Using the current population baseline, that works out to roughly 1 in 2,720,273 residents.
How common is Tomaszewicz?
Tomaszewicz 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 Tomaszewicz. 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 Tomaszewicz.
Has Tomaszewicz become more or less common over time?
Between 2010 and 2020, the surname Tomaszewicz went from 101 recorded bearers to 110. That is an increase of 9 (+8.9%). In the national ranking it rose from #159,712 to #149,446.
What does the Census say about the background of Tomaszewicz?
Among Census respondents with the surname Tomaszewicz, the largest self-reported group is White at 86.4%. The next largest groups are Hispanic (4.5%) and Asian/Pacific Islander (4.5%). 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 Tomaszewicz in the 2020 Census, accounting for 86.4% (95 people in the source table).
What is the full ancestry breakdown?
Tomaszewicz appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (86.4%), Hispanic (4.5%), Asian/Pacific Islander (4.5%). 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 Tomaszewicz (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 Tomaszewicz mean?
A Polish surname indicating an ancestor's relation to Thomas, the biblical apostle. 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 Tomaszewicz (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 Tomaszewicz?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.