2010
#144,141
National surname rank
Recorded bearers 115
First available Census row
Per 100,000 0.04
Very Rare Last name
Kacmarynski
Of Polish origin referring to someone from an area called Kacmarz.
According to the 2020 US Census Bureau surname tables, roughly 123 Americans carry the last name Kacmarynski. That puts it at #151,639 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,786,621 residents).
This page is the full Name Census profile for the Kacmarynski 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
123
1 in 2,786,621
Census rank
#151,639
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
107
very rare in the US
Popularity narrative
The Census Bureau recorded 107 bearers of the surname Kacmarynski in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 151639th position in the national surname ranking.
Among Census respondents with the surname Kacmarynski, the largest self-reported group is White at 98.1%. The next largest groups are Hispanic (1.9%).
Origin
Meaning and origin of Kacmarynski
The surname KACMARYNSKI is of Polish origin, with its roots traced back to the 16th century. It is believed to have originated in the Krakow region, where it was likely derived from the Polish words "kaczmarza" (meaning "duck keeper") and "kaczor" (meaning "drake" or "male duck"). This suggests that the earliest bearers of this name may have been involved in raising or tending to ducks, either as a profession or a means of subsistence.
Historical records show that the KACMARYNSKI surname first appeared in the town of Niepolomice, near Krakow, in the late 1500s. One of the earliest documented instances is found in the parish records of the Church of St. Mary in Niepolomice, where a Jan KACMARYNSKI is mentioned as a resident in 1587.
Throughout the 17th and 18th centuries, the KACMARYNSKI name continued to be prevalent in the Krakow region, with several notable individuals bearing this surname. One such figure was Stanislaw KACMARYNSKI (1632-1701), a prominent landowner and magistrate in the town of Wieliczka, known for his involvement in local governance and judicial affairs.
In the 19th century, the KACMARYNSKI surname began to spread beyond its traditional stronghold in southern Poland. Franciszek KACMARYNSKI (1788-1856), a respected educator and author, was born in the village of Wronki, in what is now western Poland. His published works on pedagogy and moral philosophy gained him recognition throughout the Polish lands.
Another notable individual with this surname was Jadwiga KACMARYNSKA (1867-1932), a pioneering feminist and social activist from Warsaw. She was instrumental in establishing several organizations dedicated to improving the rights and opportunities for women in Poland during the early 20th century.
As Polish immigrants began to settle in other parts of Europe and the Americas in the late 19th and early 20th centuries, the KACMARYNSKI surname also found its way to new lands. One such individual was Jan KACMARYNSKI (1892-1968), who emigrated from Krakow to the United States in 1912 and became a respected businessman and community leader in the Polish-American community of Detroit.
While the KACMARYNSKI surname may not be among the most common Polish surnames, it has a rich history that can be traced back several centuries. Its origins are deeply rooted in the cultural and linguistic traditions of southern Poland, particularly the Krakow region, where it first emerged as a distinctive family name.
Demographics
Ancestry and ethnicity for Kacmarynski
Among Census respondents with the surname Kacmarynski, the largest self-reported group is White at 98.1%. The next largest groups are Hispanic (1.9%).
The bar chart below shows how Kacmarynski 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 Kacmarynski surname at the time of the 2020 Census, not any inherent property of the name itself.
- White98.1% · 105
- Hispanic or Latino1.9% · 2
Timeline
Historical Census data for Kacmarynski
Kacmarynski 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
#151,639
National surname rank
Recorded bearers 107
-8 bearers (-7.0%)
Per 100,000 0.04
Rank movement Down 7,498 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #144,141 | 115 | 0.04 | First available Census row | First available Census row |
| 2020 | #151,639 | 107 | 0.04 | -8 bearers (-7.0%) | Down 7,498 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 Kacmarynski 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 | #144,141 | #151,639 | -5.2% |
| Count | 115 | 107 | -7.0% |
| Per 100K | 0.04 | 0.04 | -10.5% |
Between the 2010 and 2020 Census, the number of Kacmarynski bearers went from 115 to 107 (-7.0% change). The surname moved down 7,498 positions in the national ranking, going from #144,141 to #151,639.
FAQ
Kacmarynski surname: questions and answers
How many people in the U.S. have the surname Kacmarynski?
Name Census estimates that about 123 living Americans carry the surname Kacmarynski. Using the current population baseline, that works out to roughly 1 in 2,786,621 residents.
How common is Kacmarynski?
Kacmarynski ranks #151,639 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 107 people with the surname Kacmarynski. That is different from the site's living-bearer estimate (123), 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 Kacmarynski.
Has Kacmarynski become more or less common over time?
Between 2010 and 2020, the surname Kacmarynski went from 115 recorded bearers to 107. That is a decrease of 8 (-7.0%). In the national ranking it fell from #144,141 to #151,639.
What does the Census say about the background of Kacmarynski?
Among Census respondents with the surname Kacmarynski, the largest self-reported group is White at 98.1%. The next largest groups are Hispanic (1.9%). 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 Kacmarynski in the 2020 Census, accounting for 98.1% (105 people in the source table).
What is the full ancestry breakdown?
Kacmarynski appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (98.1%), Hispanic (1.9%). 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 Kacmarynski (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 Kacmarynski mean?
Of Polish origin referring to someone from an area called Kacmarz. 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 Kacmarynski (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 have the last name Kacmarynski?
Our sister site HowManyOfMe.org answers how common the surname Kacmarynski is at a glance, with the living-bearer count up front.