The Janiak surname
In the 2010 U.S. Census, 781 people carried this name — #30,043 among all U.S. surnames, about 1 in every 384,600 people counted. About the same as in 2000 (779).
In Poland’s population register
10,379 people named Janiak have a registered home in Poland.
Of the 11,251 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 Greater Poland.
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 France’s civil register
France’s register of deaths holds 133 people named Janiak.
49 of them were born outside France. Those born in France came from 25 départements, most often Pas-de-Calais.
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.
In Switzerland’s population statistics
32 people named Janiak live in Switzerland.
They live in 6 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 the Nordic population registers
49 people named Janiak 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).
Who carried it
People named Janiak,
with a public archive behind them.
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Marian I. Janiak 1908–1983 · veterinarian
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Bolesław Janiak 1914–1945
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Franciszek Janiak 1919– · farmer
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Kazimierz Janiak 1924–1986 · politician
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Czesław Janiak 1924–1945
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Kazimierz Janiak 1931– · athletics competitor
Wikidata (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Janiak.
- Janas 919 · U.S. census
- Janczak 685 · U.S. census
- Janer 203 · U.S. census
- Janes 7,659 · U.S. census
- Janet 437 · U.S. census
- Janey 666 · U.S. census
- Janicki 1,940 · U.S. census
- Janiec 305 · U.S. census
- Janik 3,265 · U.S. census
- Janin 110 · U.S. census
- Janis 4,233 · U.S. census
- Janiszewski 1,159 · U.S. census
When the index is not enough
This page says where Janiak 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.