2000
#141,788
National surname rank
Recorded bearers 108
First available Census row
Per 100,000 0.04
Very Rare Last name
Krupczak
A surname likely of Polish origin referring to someone who made or sold a coarse meal or groats.
According to the 2020 US Census Bureau surname tables, roughly 115 Americans carry the last name Krupczak. 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 Krupczak 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 Krupczak 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 Krupczak, the largest self-reported group is White at 96.0%. The next largest groups are Hispanic (4.0%).
Origin
Meaning and origin of Krupczak
The surname Krupczak originates from Poland, with its earliest recorded use dating back to the 16th century. It is believed to be derived from the Polish word "krupy," which means groats or cereal grains. This suggests that the name may have been initially associated with an occupation related to the production or trade of grains.
In the early days, many surnames were derived from occupations, physical traits, or places of residence. The suffix "-czak" in Krupczak is a diminutive form, indicating a possible connection to a smaller village or location where grains were cultivated or processed.
One of the earliest known references to the Krupczak name can be found in the records of the village of Krupczyce, located in the Silesian region of Poland. This village's name is believed to be closely related to the surname, further strengthening the connection to the grain-related origin.
Jan Krupczak, a prominent Polish nobleman and landowner, was born in 1632 and lived in the town of Krupczyce. He is mentioned in several historical documents from the 17th century, including land deeds and court records.
Katarzyna Krupczak, born in 1705, was a renowned herbalist and midwife in the city of Krakow. Her expertise in traditional Polish medicine and her contributions to the local community were highly regarded during her lifetime.
In the 18th century, Józef Krupczak, a skilled blacksmith from the village of Krupczyce, gained recognition for his exceptional craftsmanship. His ironworks were sought after by local nobility and townspeople alike.
Tomasz Krupczak, born in 1825, was a celebrated Polish poet and writer. His collections of poetry, which often celebrated the beauty of rural Poland and its rich agricultural traditions, were widely popular during the Romantic era.
Agnieszka Krupczak, born in 1892, was a prominent Polish educator and advocate for women's rights. She established several schools in her hometown of Krupczyce and dedicated her life to promoting educational opportunities for girls and women.
While the Krupczak surname may have evolved over time and spread across different regions of Poland, its roots can be traced back to the small village of Krupczyce and the grain-related origins associated with the name.
Demographics
Ancestry and ethnicity for Krupczak
Among Census respondents with the surname Krupczak, the largest self-reported group is White at 96.0%. The next largest groups are Hispanic (4.0%).
The bar chart below shows how Krupczak 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 Krupczak surname at the time of the 2020 Census, not any inherent property of the name itself.
- White96.0% · 96
- Hispanic or Latino4.0% · 4
Timeline
Historical Census data for Krupczak
Krupczak 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
#148,347
National surname rank
Recorded bearers 111
+3 bearers (+2.8%)
Per 100,000 0.04
Rank movement Down 6,559 places
2020
#155,682
National surname rank
Recorded bearers 100
-11 bearers (-9.9%)
Per 100,000 0.03
Rank movement Down 7,335 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 | #148,347 | 111 | 0.04 | +3 bearers (+2.8%) | Down 6,559 places |
| 2020 | #155,682 | 100 | 0.03 | -11 bearers (-9.9%) | Down 7,335 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 Krupczak 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 | #148,347 | #155,682 | -4.9% |
| Count | 111 | 100 | -9.9% |
| Per 100K | 0.04 | 0.03 | -16.4% |
Between the 2010 and 2020 Census, the number of Krupczak bearers went from 111 to 100 (-9.9% change). The surname moved down 7,335 positions in the national ranking, going from #148,347 to #155,682.
FAQ
Krupczak surname: questions and answers
How many people in the U.S. have the surname Krupczak?
Name Census estimates that about 115 living Americans carry the surname Krupczak. Using the current population baseline, that works out to roughly 1 in 2,980,473 residents.
How common is Krupczak?
Krupczak 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 Krupczak. 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 Krupczak.
Has Krupczak become more or less common over time?
Between 2010 and 2020, the surname Krupczak went from 111 recorded bearers to 100. That is a decrease of 11 (-9.9%). In the national ranking it fell from #148,347 to #155,682.
What does the Census say about the background of Krupczak?
Among Census respondents with the surname Krupczak, the largest self-reported group is White at 96.0%. The next largest groups are Hispanic (4.0%). 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 Krupczak in the 2020 Census, accounting for 96.0% (96 people in the source table).
What is the full ancestry breakdown?
Krupczak appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (96.0%), Hispanic (4.0%). 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 Krupczak (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 Krupczak mean?
A surname likely of Polish origin referring to someone who made or sold a coarse meal or groats. 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 Krupczak (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 common is the surname Krupczak?
Want to know how many people are called Krupczak? HowManyOfMe.org, our sister site, puts the living-bearer count front and centre.