2010
#145,220
National surname rank
Recorded bearers 114
First available Census row
Per 100,000 0.04
Very Rare Last name
Kasiewicz
A Polish surname derived from the word "koza" meaning goat.
According to the 2020 US Census Bureau surname tables, roughly 116 Americans carry the last name Kasiewicz. 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 Kasiewicz 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 Kasiewicz 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 Kasiewicz, the largest self-reported group is White at 92.1%. The next largest groups are Hispanic (3.0%) and Two or More Races (3.0%).
Origin
Meaning and origin of Kasiewicz
The surname Kasiewicz originates from Poland, with its roots traced back to the 17th century. It is a Polish patronymic name, derived from the personal name Kasik or Kaska, which were diminutive forms of the name Kazimierz.
Kasiewicz was initially found in the regions of Wielkopolska and Mazowsze, where it first emerged. The name's spelling variations include Kasiewicz, Kasiowicz, and Kasiewic. These variations likely arose due to regional dialects and the evolving nature of the Polish language over time.
One of the earliest recorded instances of the surname Kasiewicz can be found in the parish records of the town of Konin, dating back to the late 17th century. These records document the births, marriages, and deaths of individuals bearing this surname, providing valuable insights into its historical prevalence.
In the 18th century, the Kasiewicz name gained prominence with the birth of Franciszek Kasiewicz (1699-1784), a Polish painter and engraver renowned for his religious works and portraits. His artistic contributions left a lasting impact on the cultural landscape of the time.
Another notable figure was Józef Kasiewicz (1812-1891), a Polish historian and writer who made significant contributions to the study of Polish history and literature. His works, including "Historia Literatury Polskiej" (History of Polish Literature), are widely recognized and respected within academic circles.
During the 19th century, the Kasiewicz surname was also associated with the town of Kasiewo, located in the Kuyavian-Pomeranian Voivodeship of Poland. It is believed that some individuals adopted the surname as a reference to their place of origin or residence.
In the late 19th and early 20th centuries, several individuals with the Kasiewicz surname played important roles in various fields. Stanisław Kasiewicz (1863-1937) was a notable Polish economist and statistician, while Jan Kasiewicz (1885-1977) was a renowned architect and urban planner who left his mark on the architectural landscape of Warsaw.
Throughout its history, the Kasiewicz surname has been carried by individuals from diverse backgrounds, including academics, artists, writers, and professionals, contributing to the rich tapestry of Polish culture and society.
Demographics
Ancestry and ethnicity for Kasiewicz
Among Census respondents with the surname Kasiewicz, the largest self-reported group is White at 92.1%. The next largest groups are Hispanic (3.0%) and Two or More Races (3.0%).
The bar chart below shows how Kasiewicz 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 Kasiewicz surname at the time of the 2020 Census, not any inherent property of the name itself.
- White92.1% · 93
- Hispanic or Latino3.0% · 3
- Two or more races3.0% · 3
- Asian and Pacific Islander2.0% · 2
Timeline
Historical Census data for Kasiewicz
Kasiewicz 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
#155,270
National surname rank
Recorded bearers 101
-13 bearers (-11.4%)
Per 100,000 0.03
Rank movement Down 10,050 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #145,220 | 114 | 0.04 | First available Census row | First available Census row |
| 2020 | #155,270 | 101 | 0.03 | -13 bearers (-11.4%) | Down 10,050 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 Kasiewicz 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 | #145,220 | #155,270 | -6.9% |
| Count | 114 | 101 | -11.4% |
| Per 100K | 0.04 | 0.03 | -15.5% |
Between the 2010 and 2020 Census, the number of Kasiewicz bearers went from 114 to 101 (-11.4% change). The surname moved down 10,050 positions in the national ranking, going from #145,220 to #155,270.
FAQ
Kasiewicz surname: questions and answers
How many people in the U.S. have the surname Kasiewicz?
Name Census estimates that about 116 living Americans carry the surname Kasiewicz. Using the current population baseline, that works out to roughly 1 in 2,954,779 residents.
How common is Kasiewicz?
Kasiewicz 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 Kasiewicz. 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 Kasiewicz.
Has Kasiewicz become more or less common over time?
Between 2010 and 2020, the surname Kasiewicz went from 114 recorded bearers to 101. That is a decrease of 13 (-11.4%). In the national ranking it fell from #145,220 to #155,270.
What does the Census say about the background of Kasiewicz?
Among Census respondents with the surname Kasiewicz, the largest self-reported group is White at 92.1%. The next largest groups are Hispanic (3.0%) and Two or More Races (3.0%). 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 Kasiewicz in the 2020 Census, accounting for 92.1% (93 people in the source table).
What is the full ancestry breakdown?
Kasiewicz appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (92.1%), Hispanic (3.0%), Two or More Races (3.0%). 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 Kasiewicz (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 Kasiewicz mean?
A Polish surname derived from the word "koza" meaning goat. 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 Kasiewicz (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 Kasiewicz?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.