2000
#9,387
National surname rank
Recorded bearers 3,183
First available Census row
Per 100,000 1.18
Rare Last name
Koziol
A Polish occupational surname referring to someone who kept goats or worked as a goatherd.
According to the 2020 US Census Bureau surname tables, roughly 3,555 Americans carry the last name Koziol. That puts it at #9,943 in the national surname ranking, appearing at a frequency of 1.04 per 100,000 people (about 1 in 96,415 residents).
This page is the full Name Census profile for the Koziol 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.
For British records, Name Census UK has a British surname profile for Koziol with 1881 census detail, origin facts and modern UK distribution where available.
Bearers in the US
3.6K
1 in 96,415
Census rank
#9,943
2020 decennial data
Per 100,000
1.0
Frequency rate
Recorded bearers
3.1K
rare in the US
Popularity narrative
The Census Bureau recorded 3,100 bearers of the surname Koziol in its 2020 decennial surname file. At a rate of 1.04 per 100,000 residents, it holds the 9943rd position in the national surname ranking.
Among Census respondents with the surname Koziol, the largest self-reported group is White at 93.8%. The next largest groups are Hispanic (3.2%) and Two or More Races (1.9%).
Origin
Meaning and origin of Koziol
The surname Koziol originated in Poland, and its roots can be traced back to the 14th century. It is derived from the Polish word "kozioł," which means "goat" or "billy goat." This suggests that the name may have initially been given as a nickname or descriptive name to someone who resembled a goat or worked with goats.
In the Middle Ages, surnames were often derived from occupations, physical traits, or geographical locations. The Koziol surname likely emerged as a way to distinguish individuals within a community, and it is believed to have originated in the regions of Silesia and Greater Poland.
One of the earliest recorded instances of the Koziol surname can be found in the "Księga Henrykowska" (Book of Henryków), a medieval manuscript from the 13th century that contains records of land ownership and transactions in the Silesian region. This document mentions a "Koziol" as a landowner in the village of Henryków.
Another notable historical reference is the "Księga Ziemska Krakowska" (Cracow Land Book), a 15th-century legal document from the city of Krakow. This book includes entries related to the ownership and transfer of properties, and it lists several individuals with the surname Koziol.
In the 16th century, a prominent figure named Jan Koziol (1501-1568) was a Polish nobleman and landowner. He held significant influence in the region of Greater Poland and played a role in the political affairs of the Polish-Lithuanian Commonwealth.
During the 17th century, the Koziol surname gained recognition through the works of Wojciech Koziol (1619-1677), a Polish writer and poet who authored several religious and philosophical texts.
Another notable person with this surname was Józef Koziol (1757-1831), a Polish military officer who served in the Napoleonic Wars and fought against the Prussian and Russian forces during the Polish uprisings of the early 19th century.
In the 19th century, Kazimierz Koziol (1824-1899) was a Polish lawyer and politician who advocated for the rights of the Polish people under the rule of the Russian Empire.
Throughout history, the Koziol surname has been associated with various professions, including farming, craftsmanship, and intellectual pursuits, reflecting the diverse backgrounds and contributions of those who bore this name.
Demographics
Ancestry and ethnicity for Koziol
Among Census respondents with the surname Koziol, the largest self-reported group is White at 93.8%. The next largest groups are Hispanic (3.2%) and Two or More Races (1.9%).
The bar chart below shows how Koziol 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 Koziol surname at the time of the 2020 Census, not any inherent property of the name itself.
- White93.8% · 2,908
- Hispanic or Latino3.2% · 99
- Two or more races1.9% · 58
- Asian and Pacific Islander0.5% · 17
- American Indian and Alaska Native0.4% · 11
- Black or African American0.2% · 7
Timeline
Historical Census data for Koziol
Koziol 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
#10,090
National surname rank
Recorded bearers 3,194
+11 bearers (+0.3%)
Per 100,000 1.08
Rank movement Down 703 places
2020
#9,943
National surname rank
Recorded bearers 3,100
-94 bearers (-2.9%)
Per 100,000 1.04
Rank movement Up 147 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #9,387 | 3,183 | 1.18 | First available Census row | First available Census row |
| 2010 | #10,090 | 3,194 | 1.08 | +11 bearers (+0.3%) | Down 703 places |
| 2020 | #9,943 | 3,100 | 1.04 | -94 bearers (-2.9%) | Up 147 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 Koziol 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 | #10,090 | #9,943 | 1.5% |
| Count | 3,194 | 3,100 | -2.9% |
| Per 100K | 1.08 | 1.04 | -4.0% |
Between the 2010 and 2020 Census, the number of Koziol bearers went from 3,194 to 3,100 (-2.9% change). The surname moved up 147 positions in the national ranking, going from #10,090 to #9,943.
FAQ
Koziol surname: questions and answers
How many people in the U.S. have the surname Koziol?
Name Census estimates that about 3,555 living Americans carry the surname Koziol. Using the current population baseline, that works out to roughly 1 in 96,415 residents.
How common is Koziol?
Koziol ranks #9,943 in the 2020 Census surname tables and is classified on this site as "Rare." The Census recorded the name at a frequency of 1.04 per 100,000 residents, which is about 1 people out of every 100,000.
How many people with this surname were counted in the Census?
The raw 2020 Census file counted 3,100 people with the surname Koziol. That is different from the site's living-bearer estimate (3,555), which projects the surname's present-day count by applying the Census frequency rate to the current U.S. population.
What does 1.04 per 100,000 actually mean?
It is the Census Bureau's normalized frequency measure. A rate of 1.04 per 100,000 means that if you picked a random group of 100,000 U.S. residents, you would expect about 1 of them to have the surname Koziol.
Has Koziol become more or less common over time?
Between 2010 and 2020, the surname Koziol went from 3,194 recorded bearers to 3,100. That is a decrease of 94 (-2.9%). In the national ranking it rose from #10,090 to #9,943.
What does the Census say about the background of Koziol?
Among Census respondents with the surname Koziol, the largest self-reported group is White at 93.8%. The next largest groups are Hispanic (3.2%) and Two or More Races (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 Koziol in the 2020 Census, accounting for 93.8% (2,908 people in the source table).
What is the full ancestry breakdown?
Koziol appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (93.8%), Hispanic (3.2%), Two or More Races (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 Koziol (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 Koziol mean?
A Polish occupational surname referring to someone who kept goats or worked as a goatherd. 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 Koziol (1.04 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 Americans have the surname Koziol?
For a quick modern estimate, our sister site HowManyOfMe.org answers that in one glance, with the living-bearer count front and centre.