2000
#54,880
National surname rank
Recorded bearers 351
First available Census row
Per 100,000 0.13
Very Rare Last name
Kumor
A surname derived from Polish and Slavic roots meaning "godfather" or "sponsor."
According to the 2020 US Census Bureau surname tables, roughly 469 Americans carry the last name Kumor. That puts it at #54,407 in the national surname ranking, appearing at a frequency of 0.14 per 100,000 people (about 1 in 730,819 residents).
This page is the full Name Census profile for the Kumor 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
469
1 in 730,819
Census rank
#54,407
2020 decennial data
Per 100,000
0.1
Frequency rate
Recorded bearers
409
very rare in the US
Popularity narrative
The Census Bureau recorded 409 bearers of the surname Kumor in its 2020 decennial surname file. At a rate of 0.14 per 100,000 residents, it holds the 54407th position in the national surname ranking.
Among Census respondents with the surname Kumor, the largest self-reported group is White at 92.4%. The next largest groups are Asian/Pacific Islander (3.4%) and Two or More Races (2.2%).
Origin
Meaning and origin of Kumor
The surname KUMOR is believed to have originated in the region of present-day Poland and Ukraine during the medieval period. Its roots can be traced back to the Slavic word "kumir," which means "idol" or "pagan god." This suggests that the name may have been associated with individuals involved in pagan rituals or worship practices.
One of the earliest recorded instances of the name KUMOR can be found in a 14th-century manuscript from the town of Krakow, where it was listed as a surname for a local family. It is also documented in various tax records and land registers from the 15th and 16th centuries in the regions of Galicia and Volhynia, which were part of the Polish-Lithuanian Commonwealth at the time.
During the 16th and 17th centuries, the name KUMOR appeared in several historical documents related to the Polish nobility. One notable figure was Jan KUMOR (1548-1625), a Polish nobleman and landowner who served as a military commander during the Polish-Swedish Wars.
In the 18th century, the name KUMOR gained prominence in the literary world with the birth of Aleksander KUMOR (1731-1804), a renowned Polish poet and playwright who was celebrated for his satirical works and contributions to the Enlightenment movement in Poland.
Another significant figure bearing the surname KUMOR was Józef KUMOR (1856-1932), a Polish engineer and architect who played a crucial role in the development of modern infrastructure in the cities of Warsaw and Krakow. His notable works include the design of several iconic bridges and public buildings.
As the centuries progressed, the name KUMOR continued to be associated with notable individuals in various fields. For instance, Bronisław KUMOR (1907-1998) was a renowned Polish historian and academic who specialized in the study of church history and the role of the Catholic Church in Poland.
It is important to note that while the surname KUMOR has its roots in the Slavic regions of Poland and Ukraine, it has also been adopted by families in other parts of the world due to migration and cultural exchange. However, the historical records and references mentioned above provide valuable insights into the origins and evolution of this surname over the centuries.
Demographics
Ancestry and ethnicity for Kumor
Among Census respondents with the surname Kumor, the largest self-reported group is White at 92.4%. The next largest groups are Asian/Pacific Islander (3.4%) and Two or More Races (2.2%).
The bar chart below shows how Kumor 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 Kumor surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.4% · 378
- Asian and Pacific Islander3.4% · 14
- Two or more races2.2% · 9
- Hispanic or Latino1.2% · 5
- Black or African American0.5% · 2
- American Indian and Alaska Native0.2% · 1
Timeline
Historical Census data for Kumor
Kumor 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
#56,836
National surname rank
Recorded bearers 359
+8 bearers (+2.3%)
Per 100,000 0.12
Rank movement Down 1,956 places
2020
#54,407
National surname rank
Recorded bearers 409
+50 bearers (+13.9%)
Per 100,000 0.14
Rank movement Up 2,429 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #54,880 | 351 | 0.13 | First available Census row | First available Census row |
| 2010 | #56,836 | 359 | 0.12 | +8 bearers (+2.3%) | Down 1,956 places |
| 2020 | #54,407 | 409 | 0.14 | +50 bearers (+13.9%) | Up 2,429 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 Kumor 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 | #56,836 | #54,407 | 4.3% |
| Count | 359 | 409 | 13.9% |
| Per 100K | 0.12 | 0.14 | 14.0% |
Between the 2010 and 2020 Census, the number of Kumor bearers went from 359 to 409 (+13.9% change). The surname moved up 2,429 positions in the national ranking, going from #56,836 to #54,407.
FAQ
Kumor surname: questions and answers
How many people in the U.S. have the surname Kumor?
Name Census estimates that about 469 living Americans carry the surname Kumor. Using the current population baseline, that works out to roughly 1 in 730,819 residents.
How common is Kumor?
Kumor ranks #54,407 in the 2020 Census surname tables and is classified on this site as "Very Rare." The Census recorded the name at a frequency of 0.14 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 409 people with the surname Kumor. That is different from the site's living-bearer estimate (469), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 0.14 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 0.14 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 Kumor.
Has Kumor become more or less common over time?
Between 2010 and 2020, the surname Kumor went from 359 recorded bearers to 409. That is an increase of 50 (+13.9%). In the national ranking it rose from #56,836 to #54,407.
What does the Census say about the background of Kumor?
Among Census respondents with the surname Kumor, the largest self-reported group is White at 92.4%. The next largest groups are Asian/Pacific Islander (3.4%) and Two or More Races (2.2%). 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 Kumor in the 2020 Census, accounting for 92.4% (378 people in the source table).
What is the full ancestry breakdown?
Kumor appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.4%), Asian/Pacific Islander (3.4%), Two or More Races (2.2%). 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 Kumor (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 Kumor mean?
A surname derived from Polish and Slavic roots meaning "godfather" or "sponsor." 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 Kumor (0.14 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 Kumor?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.