2000
#127,186
National surname rank
Recorded bearers 124
First available Census row
Per 100,000 0.05
Very Rare Last name
Kozlowicz
A Polish surname derived from the word "kozioł" meaning "goat".
According to the 2020 US Census Bureau surname tables, roughly 125 Americans carry the last name Kozlowicz. 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 Kozlowicz 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 Kozlowicz 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 Kozlowicz, the largest self-reported group is White at 89.0%. The next largest groups are Hispanic (3.7%) and Two or More Races (3.7%).
Origin
Meaning and origin of Kozlowicz
The surname Kozlowicz is of Polish origin and can be traced back to the early medieval period. It derives from the Polish word 'koziol', meaning 'goat', suggesting that the original bearer may have been a goat herder or lived in an area associated with goats. Variations of the spelling include Kozlowicz, Kozlovich, and Kozlovski.
Historical records indicate that the name first appeared in the Sandomierz region of southern Poland in the 13th century. The earliest known reference is found in a manuscript from the Cistercian monastery in Wachock, which mentions a nobleman named Mikolaj Kozlowicz who donated land to the monastery in 1258.
In the 14th century, the name Kozlowicz is found in the records of the city of Krakow, where several members of the family were merchants and landowners. One notable figure was Jan Kozlowicz, a wealthy trader who served as a city councilor in the 1370s.
During the 15th century, the Kozlowicz family spread to other parts of Poland, and some members adopted the noble title 'von Kozlowicz'. In 1492, a knight named Jakub von Kozlowicz is recorded as participating in a military campaign against the Teutonic Knights in Prussia.
In the 16th century, a branch of the Kozlowicz family settled in the town of Kazimierz Dolny, where they were prominent landowners and businessmen. Stanislaw Kozlowicz (1550-1612) was a respected merchant and philanthropist who funded the construction of a church and a hospital in the town.
Another notable figure was Marianna Kozlowicz (1672-1748), a Polish noblewoman and poet who was renowned for her literary salons in Warsaw. Her collection of poems, titled "Wiersze Rózne" (Various Poems), was published in 1720 and praised for its lyrical beauty and philosophical depth.
The Kozlowicz name continued to be prominent in Poland throughout the 17th and 18th centuries, with members of the family serving as military officers, clergy, and influential landowners. In the 19th century, as the Polish territories were partitioned among neighboring empires, many Kozlowicz families emigrated to other parts of Europe and the Americas, carrying their surname with them.
Demographics
Ancestry and ethnicity for Kozlowicz
Among Census respondents with the surname Kozlowicz, the largest self-reported group is White at 89.0%. The next largest groups are Hispanic (3.7%) and Two or More Races (3.7%).
The bar chart below shows how Kozlowicz 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 Kozlowicz surname at the time of the 2020 Census, not any inherent property of the name itself.
- White89.0% · 97
- Hispanic or Latino3.7% · 4
- Two or more races3.7% · 4
- American Indian and Alaska Native2.8% · 3
- Black or African American0.9% · 1
Timeline
Historical Census data for Kozlowicz
Kozlowicz 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
#144,141
National surname rank
Recorded bearers 115
-9 bearers (-7.3%)
Per 100,000 0.04
Rank movement Down 16,955 places
2020
#150,205
National surname rank
Recorded bearers 109
-6 bearers (-5.2%)
Per 100,000 0.04
Rank movement Down 6,064 places
| Year | Rank | Count | Per 100K | Count change | Rank change |
|---|---|---|---|---|---|
| 2000 | #127,186 | 124 | 0.05 | First available Census row | First available Census row |
| 2010 | #144,141 | 115 | 0.04 | -9 bearers (-7.3%) | Down 16,955 places |
| 2020 | #150,205 | 109 | 0.04 | -6 bearers (-5.2%) | Down 6,064 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 Kozlowicz 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 | #150,205 | -4.2% |
| Count | 115 | 109 | -5.2% |
| Per 100K | 0.04 | 0.04 | -8.8% |
Between the 2010 and 2020 Census, the number of Kozlowicz bearers went from 115 to 109 (-5.2% change). The surname moved down 6,064 positions in the national ranking, going from #144,141 to #150,205.
FAQ
Kozlowicz surname: questions and answers
How many people in the U.S. have the surname Kozlowicz?
Name Census estimates that about 125 living Americans carry the surname Kozlowicz. Using the current population baseline, that works out to roughly 1 in 2,742,035 residents.
How common is Kozlowicz?
Kozlowicz 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 Kozlowicz. 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 Kozlowicz.
Has Kozlowicz become more or less common over time?
Between 2010 and 2020, the surname Kozlowicz went from 115 recorded bearers to 109. That is a decrease of 6 (-5.2%). In the national ranking it fell from #144,141 to #150,205.
What does the Census say about the background of Kozlowicz?
Among Census respondents with the surname Kozlowicz, the largest self-reported group is White at 89.0%. The next largest groups are Hispanic (3.7%) and Two or More Races (3.7%). 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 Kozlowicz in the 2020 Census, accounting for 89.0% (97 people in the source table).
What is the full ancestry breakdown?
Kozlowicz appears across multiple self-reported groups in the Census data. The largest shares in the 2020 file are White (89.0%), Hispanic (3.7%), Two or More Races (3.7%). 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 Kozlowicz (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 Kozlowicz mean?
A Polish surname derived from the word "kozioł" 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 Kozlowicz (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 share the surname Kozlowicz?
For a faster, more casual read, check HowManyOfMe.org — our sister site built around that single question.