The Kusiak surname
In the 2010 U.S. Census, 541 people carried this name — #40,432 among all U.S. surnames, about 1 in every 555,600 people counted. That is down 7% from 584 in 2000.
In Poland’s population register
5,431 people named Kusiak have a registered home in Poland.
Of the 6,001 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 113 people named Kusiak 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 Misiones.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where 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 54 people named Kusiak.
22 of them were born outside France. Those born in France came from 12 départements, most often Oise.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they were born
Fichier des personnes décédées, INSEE — Licence Ouverte 2.0 · deaths recorded in France since 1970, by place of birth.
Who carried it
People named Kusiak,
with a public archive behind them.
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Zygmunt Kusiak 1897–1940 -
Jerzy Kusiak 1921–2013 · politician -
Michał Kusiak 1907–1970 · politician
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Zygmunt Kusiak 1919–1942
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Alfred Kusiak 1930–2017
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Franciszek Kusiak 1942– · historian
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Kusiak.
When the index is not enough
This page says where Kusiak 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.