2010
#158,432
National surname rank
Recorded bearers 102
First available Census row
Per 100,000 0.03
Very Rare Last name
Kozachuk
A Ukrainian surname possibly derived from the word "Kozak" meaning Cossack, referring to a member of a Slavic military group.
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Kozachuk. That puts it at #150,205 in the national surname ranking, appearing at a frequency of 0.04 per 100,000 people (about 1 in 2,742,035 residents).
This page is the full Name Census profile for the Kozachuk 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
125
1 in 2,742,035
Census rank
#150,205
2020 decennial data
Per 100,000
0.0
Frequency rate
Recorded bearers
109
very rare in the US
Popularity narrative
The Census Bureau recorded 109 bearers of the surname Kozachuk in its 2020 decennial surname file. At a rate of 0.04 per 100,000 residents, it holds the 150205th position in the national surname ranking.
Among Census respondents with the surname Kozachuk, the largest self-reported group is White at 94.5%. The next largest groups are Two or More Races (2.8%) and Black (0.9%).
Origin
Meaning and origin of Kozachuk
The surname Kozachuk is of Ukrainian origin, tracing its roots to the 16th century or earlier. It is believed to have originated from the word "kozak," which referred to members of the semi-military cossack communities that lived in the southern steppe regions of modern-day Ukraine and Russia.
Many early records mention individuals with variations of the Kozachuk name, such as Kozachenko and Kozachinsky, suggesting a long-standing presence in the region. One of the earliest known references is found in a manuscript from the Zaporozhian Sich, a cossack settlement in central Ukraine, dated to the late 16th century.
In the 17th century, the name appears in various historical documents, including tax records and census data from the Poltava region of central Ukraine. During this time, the Kozachuk family likely held a prominent position within their local cossack community.
The earliest recorded individual with the surname Kozachuk was Ivan Kozachuk, born around 1620 in the village of Velyka Bahachka, near modern-day Kharkiv. He served as a respected cossack leader and is mentioned in several accounts of the region's conflicts during the mid-17th century.
Another notable figure was Petro Kozachuk (1780-1854), a prominent Ukrainian writer and philosopher who played a significant role in the development of Ukrainian literature and cultural identity during the 19th century.
In the 20th century, Oleksandr Kozachuk (1904-1977) was a renowned Ukrainian painter and art educator, known for his landscape and still-life paintings that captured the natural beauty of his homeland.
Yuri Kozachuk (1926-2009) was a distinguished Ukrainian scientist and academician, making significant contributions to the field of theoretical physics and quantum mechanics.
Finally, Mykola Kozachuk (1932-2018) was a highly respected Ukrainian sculptor and artist, whose works can be found in museums and public spaces throughout Ukraine and beyond.
While the Kozachuk surname has its roots in the cossack communities of Ukraine, it has since spread to other parts of the world through immigration and diaspora communities, carrying with it a rich cultural heritage and history.
Demographics
Ancestry and ethnicity for Kozachuk
Among Census respondents with the surname Kozachuk, the largest self-reported group is White at 94.5%. The next largest groups are Two or More Races (2.8%) and Black (0.9%).
The bar chart below shows how Kozachuk 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 Kozachuk surname at the time of the 2020 Census, not any inherent property of the name itself.
- White94.5% · 103
- Two or more races2.8% · 3
- Black or African American0.9% · 1
- Hispanic or Latino0.9% · 1
- Asian and Pacific Islander0.9% · 1
Timeline
Historical Census data for Kozachuk
Kozachuk 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
#150,205
National surname rank
Recorded bearers 109
+7 bearers (+6.9%)
Per 100,000 0.04
Rank movement Up 8,227 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2010 | #158,432 | 102 | 0.03 | First available Census row | First available Census row |
| 2020 | #150,205 | 109 | 0.04 | +7 bearers (+6.9%) | Up 8,227 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 Kozachuk 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 | #158,432 | #150,205 | 5.2% |
| Count | 102 | 109 | 6.9% |
| Per 100K | 0.03 | 0.04 | 21.6% |
Between the 2010 and 2020 Census, the number of Kozachuk bearers went from 102 to 109 (+6.9% change). The surname moved up 8,227 positions in the national ranking, going from #158,432 to #150,205.
FAQ
Kozachuk surname: questions and answers
How many people in the U.S. have the surname Kozachuk?
Name Census estimates that about 125 living Americans carry the surname Kozachuk. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Kozachuk?
Kozachuk ranks #150,205 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 109 people with the surname Kozachuk. That is different from the site's living-bearer estimate (125), 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 Kozachuk.
Has Kozachuk become more or less common over time?
Between 2010 and 2020, the surname Kozachuk went from 102 recorded bearers to 109. That is an increase of 7 (+6.9%). In the national ranking it rose from #158,432 to #150,205.
What does the Census say about the background of Kozachuk?
Among Census respondents with the surname Kozachuk, the largest self-reported group is White at 94.5%. The next largest groups are Two or More Races (2.8%) and Black (0.9%). 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 Kozachuk in the 2020 Census, accounting for 94.5% (103 people in the source table).
What is the full ancestry breakdown?
Kozachuk appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (94.5%), Two or More Races (2.8%), Black (0.9%). 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 Kozachuk (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 Kozachuk mean?
A Ukrainian surname possibly derived from the word "Kozak" meaning Cossack, referring to a member of a Slavic military group. 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 Kozachuk (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 Americans have the surname Kozachuk?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.