Explore the Family Name Kozlowski

The meaning of Kozlowski

1. Polish and Jewish (from Poland) (Kozłowski): habitational name for someone from any of various places called Kozłów (see Kozlow) + -ski suffix of surnames. Compare Koloski 2, Kosloski, Koslowski, and Kozloski. 2. Polish (Kozłowski): possibly also a variant of Koziol with the addition of the surname ending -owski. Some characteristic forenames: Polish Jerzy, Kazimierz, Stanislaw, Elzbieta, Krzysztof, Ryszard, Tadeusz, Wojciech, Zbigniew, Andrzej, Czeslaw, Ignatius.

Dictionary of American Family Names, 2nd edition, © Oxford University Press, 2022.

How common is the last name Kozlowski in the United States?

Based on data from the Decennial U.S. Census, the popularity of the surname Kozlowski has seen a slight decline between 2000 and 2010. In 2000, "Kozlowski" was ranked as the 3178th most popular surname in the United States with 10,363 individuals bearing this name, equating to about 3.84 per 100,000 people. By 2010, it had fallen to the 3449th position with a count of 10,358, representing about 3.51 per 100,000 people. The change represents an 8.53% decrease in rank and a marginal 0.05% decrease in overall count.

Proportion per 100k3.843.51-8.59%

Race and Ethnicity of people with the last name Kozlowski

The ethnic identity associated with the surname Kozlowski also saw some shifts between 2000 and 2010 according to the Decennial U.S. Census data. In 2000, 96.47% of those with the surname identified as White, 1.86% as Hispanic, 0.46% as Asian/Pacific Islander, 0.26% as American Indian and Alaskan Native, 0.11% as Black, and 0.84% identified with two or more races. By 2010, while the majority still identified as White (95.00%), there were increases in all other categories: 2.58% identified as Hispanic, 0.53% as Asian/Pacific Islander, 0.27% as American Indian and Alaskan Native, 0.22% as Black, and 1.40% identified with two or more races. This shows a general diversification of the ethnic identities associated with the surname Kozlowski over the decade.

Two or More Races0.84%1.4%66.67%
Asian/Pacific Islander0.46%0.53%15.22%
American Indian and Alaskan Native0.26%0.27%3.85%

Kozlowski ancestry composition

23andMe computes an ancestry breakdown for each customer. People may have ancestry from just one population or they may have ancestry from several populations. The most commonly-observed ancestry found in people with the surname Kozlowski is Eastern European, which comprises 39.9% of all ancestry found in people with the surname. The next two most common ancestries are British & Irish (25.0%) and French & German (19.1%). Additional ancestries include Italian, Ashkenazi Jewish, Scandinavian, Spanish & Portuguese, and Indigenous American.

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Eastern European39.9%
British & Irish25.0%
French & German19.1%

Possible origins of the surname Kozlowski

Your DNA provides clues about where your recent ancestors may have lived. Having many distant relatives in the same location suggests that you may all share common ancestry there. Locations with many distant relatives can also be places where people have migrated recently, such as large cities. If a large number of individuals who share your surname have distant relatives in a specific area, it could indicate a connection between your surname and that location, stemming from either recent ancestral ties or migration.

Based on 23andMe data, people with last name Kozlowski have recent ancestry locations spanning a few countries, mostly in Poland, and United Kingdom.

RECENT ANCESTRY LocationPercentage
Lesser Poland Voivodeship, Poland64.40%
Masovian Voivodeship, Poland63.70%
Podkarpackie Voivodeship, Poland58.80%
Podlaskie Voivodeship, Poland58.10%
West Midlands, United Kingdom57.70%

What Kozlowski haplogroups can tell you

Haplogroups are genetic population groups that share a common ancestor on either your paternal or maternal line. These paternal and maternal haplogroups shed light on your genetic ancestry and help tell the story of your family.

The top paternal haplogroup of people with the surname Kozlowski is R-CTS3402, which is predominantly found among people with European ancestry. Haplogroup R-CTS3402 is descended from haplogroup R-M420. Other common haplogroups include R-M417 and I-S17250, which are predominantly found among people with European and European ancestry. Other surnames with similar common haplogroups are: Novak, Wisniewski, Kovacs, Szabo, Kozak, Mazur, Zielinski, Nagy, Jankowski, Toth.

The most common maternal haplogroups of people with Kozlowski surname are: H1, T2b, H. These most commonly trace back to individuals of European ancestry.

kozlowskiPaternal Haplogroup Origins R-M420

Your maternal lineage may be linked to Marie Antoinette

Because it is so dominant in the general European population, haplogroup H also appears quite frequently in the continent's royal houses. Marie Antoinette, an Austrian Hapsburg who married into the French royal family, inherited the haplogroup from her maternal ancestors. So did Prince Philip, Duke of Edinburgh, whose recorded genealogy traces his female line to Bavaria. Scientists also discovered that famed 16th century astronomer Nicolaus Copernicus traced his maternal lineages to haplogroup H.

Maternal Haplo Image

What do people with the surname Kozlowski have in common?

Spoiler alert: it's complicated. People with the same last name are usually no more genetically similar than a randomly sampled group of people from the same population. That said, people with the same surname are more likely to have similar ancestries than randomly sampled individuals. The reason is the tendency of people with similar cultural or geographical backgrounds to preferentially mate with one another. That's why people who share a surname may be more likely to share traits and tendencies in common than people within the general population. Check out the percentages below to see the prevalences of tastes, habits, and traits of people with your surname compared with prevalences among 23andMe users.



Chocolate Ice Cream

Prefers chocolate flavored ice cream over other flavors.

"Kozlowski" Surname 31.1%

23andMe Users 41.3%




When sounds made by others, like the sound of chewing or yawning, provoke strong emotional reactions in an individual.

"Kozlowski" Surname 29.2%

23andMe Users 27.9%



Sugary Drink

Drinks one or more sugary drinks per day.

"Kozlowski" Surname 17.8%

23andMe Users 21.1%




A severe headache characterized by intense pain, sensitivity to light and sound, and often accompanied by nausea and vomiting.

"Kozlowski" Surname 19.7%

23andMe Users 16.4%

Are health conditions linked to the last name Kozlowski?

The short answer is that, if there is an association between surname and health, it's usually more about your ancestry than your name. Individuals with a given surname are no more genetically similar than the general population but often have similar ancestries. The populations of people associated with those shared ancestries often have sets of genetic variations, also known as alleles, in common. Some of those alleles are associated with a greater likelihood of developing certain diseases.

Disease variant frequency by ancestry

Disease allele frequencies in populations associated with the surname Kozlowski are shown below. Important Note: not everyone with a disease allele will develop these health condition

Age-Related Macular Degeneration

Y402H variant

Age-related macular degeneration (AMD) is the most common cause of irreversible vision loss among older adults. The disease results in damage to the central part of the retina (the macula), impairing vision needed for reading, driving, or even recognizing faces. The 23andMe Health + Ancestry DNA test includes the two most common variants associated with an increased risk of developing the condition: the Y402H variant in the CFH gene and the A69S variant in the ARMS2 gene. Learn more about Age-Related Macular Degeneration

Eastern European 60.6%

23andMe Users 57.2%