The Kozak surname
In the 2010 U.S. Census, 7,495 people carried this name — #4,733 among all U.S. surnames, about 1 in every 39,400 people counted. That is down 2% from 7,672 in 2000.
In Poland’s population register
21,874 people named Kozak have a registered home in Poland.
Of the 27,296 in Poland’s national register, these are the ones with a permanent address on file. They live in all 16 of Poland’s voivodeships, most of all in Lublin.
Where it concentrates, on the mapWhere they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In Argentina’s national register
At least 621 people named Kozak live in Argentina.
RENAPER only publishes a name in a province when more than ten people there share it, so the real number is higher. Most of them live in Buenos Aires Province.
Where it concentrates, on the mapWhere they live today
RENAPER (National Registry of Persons, Argentina), surnames of residents by province, December 2021 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 285 people named Kozak.
90 of them were born outside France. Those born in France came from 33 départements, most often Nord.
Where it concentrates, on the mapWhere they were born
Fichier des personnes décédées, INSEE — Licence Ouverte 2.0 · deaths recorded in France since 1970, by place of birth.
In Switzerland’s population statistics
117 people named Kozak live in Switzerland.
They live in 10 of Switzerland’s 26 cantons, most of all in Zurich.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Swiss Federal Statistical Office (FSO), «Surnames of the permanent resident population by canton», 2025, opendata.swiss/en/dataset/nachnamen-der-standigen-wohnbevolkerung-nach-kanton3 · names with fewer than 3 bearers in a canton are not published.
In Belgium’s population register
At least 93 people named Kozak live in Belgium.
Statbel only publishes a name in a municipality when five or more people there share it, so the real number is higher. Most of them live in Brussels-Capital.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In the Nordic population registers
87 people named Kozak is counted in Sweden.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published.
Counted, by country
Own calculations based on data from Statistics Sweden (SCB), surnames with at least two bearers, 31 December 2022 — CC BY 4.0 (names with 20 or more bearers shown).
In print
Kozak in American newspapers,
1921.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 4,818 pages in all carry the name.
Who carried it
People named Kozak,
with a public archive behind them.
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Juš Kozak 1892–1964 · writer -
Juš Kozak 1892–1964 · writer
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Juš Kozak 1892–1964 · writer
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Juš Kozak 1892–1964 · writer
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Ferdo Kozak 1894–1957 · writer -
Johann Sophron Kozak 1602–1685 · physician
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Kozak.
- Kowalczyk 5,615 · U.S. census
- Kowalewski 2,718 · U.S. census
- Kowalik 1,435 · U.S. census
- Kowalska 153 · U.S. census
- Kowalski 18,077 · U.S. census
- Koza 1,469 · U.S. census
- Koziel 801 · U.S. census
- Koziol 3,194 · U.S. census
- Kozlowski 10,358 · U.S. census
- Kozma 1,294 · U.S. census
- Kracher 137 · U.S. census
- Kraemer 7,726 · U.S. census
When the index is not enough
This page says where Kozak is.
A volume says what happened to it.
Every page in the index is free and stays free. The Heritage Volume is the long form: the full paper trail, the arms, the crossing — bound, and yours.