2000
#130,443
National surname rank
Recorded bearers 120
First available Census row
Per 100,000 0.04
Very Rare Last name
Delewski
A surname of Polish origin referring to someone from the region of Delevo or Delewo.
According to the 2020 US Census Bureau surname tables, roughly 116 Americans carry the last name Delewski. That puts it at #155,270 in the national surname ranking, appearing at a frequency of 0.03 per 100,000 people (about 1 in 2,954,779 residents).
This page is the full Name Census profile for the Delewski 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
116
1 in 2,954,779
Census rank
#155,270
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
101
very rare in the US
Popularity narrative
The Census Bureau recorded 101 bearers of the surname Delewski in its 2020 decennial surname file. At a rate of 0.03 per 100,000 residents, it holds the 155270th position in the national surname ranking.
Among Census respondents with the surname Delewski, the largest self-reported group is White at 96.0%. The next largest groups are Two or More Races (2.0%) and Black (1.0%).
Origin
Meaning and origin of Delewski
The surname DELEWSKI originated in Poland, emerging around the 13th century. It is a locational name derived from the town of Delewo, located in the Masovian Voivodeship region. The name likely stems from the old Polish word "delewka," meaning a small ravine or ditch.
One of the earliest recorded instances of the DELEWSKI name can be found in the Tczew Land Registry from 1389, where a landowner named Jan Delewski is mentioned. Another early reference comes from the 1432 records of the city of Gdańsk, which lists a merchant named Mikołaj Delewski.
During the 15th century, the DELEWSKI name began to spread across various regions of Poland, with notable individuals including Marcin Delewski, a burgher from Poznań (born around 1460), and Jakub Delewski, a nobleman from the village of Zabłocie near Kraków (born circa 1475).
In the 16th century, the DELEWSKI family established itself in the Lublin region, with Maciej Delewski (1520-1591) serving as a prominent judge and landowner in the town of Kazimierz Dolny. His son, Piotr Delewski (1560-1632), was a respected scholar and professor at the University of Kraków.
The 17th century saw the DELEWSKI name gain prominence in the military ranks, with Jan Delewski (1625-1689) serving as a cavalry officer during the Polish-Swedish wars and Aleksander Delewski (1640-1701) participating in the famous Battle of Vienna in 1683.
Throughout the 18th and 19th centuries, the DELEWSKI surname continued to be associated with various professions, including clergy, artists, and academics. Notable figures include Michał Delewski (1760-1832), a renowned painter and portraitist, and Franciszek Delewski (1810-1876), a respected historian and author of several works on Polish history.
Demographics
Ancestry and ethnicity for Delewski
Among Census respondents with the surname Delewski, the largest self-reported group is White at 96.0%. The next largest groups are Two or More Races (2.0%) and Black (1.0%).
The bar chart below shows how Delewski 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 Delewski surname at the time of the 2020 Census, not any inherent property of the name itself.
- White96.0% · 97
- Two or more races2.0% · 2
- Black or African American1.0% · 1
- Hispanic or Latino1.0% · 1
Timeline
Historical Census data for Delewski
Delewski 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
#153,769
National surname rank
Recorded bearers 106
-14 bearers (-11.7%)
Per 100,000 0.04
Rank movement Down 23,326 places
2020
#155,270
National surname rank
Recorded bearers 101
-5 bearers (-4.7%)
Per 100,000 0.03
Rank movement Down 1,501 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #130,443 | 120 | 0.04 | First available Census row | First available Census row |
| 2010 | #153,769 | 106 | 0.04 | -14 bearers (-11.7%) | Down 23,326 places |
| 2020 | #155,270 | 101 | 0.03 | -5 bearers (-4.7%) | Down 1,501 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 Delewski 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 | #153,769 | #155,270 | -1.0% |
| Count | 106 | 101 | -4.7% |
| Per 100K | 0.04 | 0.03 | -15.5% |
Between the 2010 and 2020 Census, the number of Delewski bearers went from 106 to 101 (-4.7% change). The surname moved down 1,501 positions in the national ranking, going from #153,769 to #155,270.
FAQ
Delewski surname: questions and answers
How many people in the U.S. have the surname Delewski?
Name Census estimates that about 116 living Americans carry the surname Delewski. Using the current population baseline, that works out to roughly 1 in 2,954,779 residents.
How common is Delewski?
Delewski ranks #155,270 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 101 people with the surname Delewski. That is different from the site's living-bearer estimate (116), 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 Delewski.
Has Delewski become more or less common over time?
Between 2010 and 2020, the surname Delewski went from 106 recorded bearers to 101. That is a decrease of 5 (-4.7%). In the national ranking it fell from #153,769 to #155,270.
What does the Census say about the background of Delewski?
Among Census respondents with the surname Delewski, the largest self-reported group is White at 96.0%. The next largest groups are Two or More Races (2.0%) and Black (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 Delewski in the 2020 Census, accounting for 96.0% (97 people in the source table).
What is the full ancestry breakdown?
Delewski appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (96.0%), Two or More Races (2.0%), Black (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 Delewski (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 Delewski mean?
A surname of Polish origin referring to someone from the region of Delevo or Delewo. 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 Delewski (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 share the surname Delewski?
HowManyOfMe.org, our sister site, answers that with the living-bearer count in one glance.