The Niewiadomski surname
In the 2010 U.S. Census, 364 people carried this name — #56,195 among all U.S. surnames, about 1 in every 833,300 people counted. That is down 4% from 378 in 2000.
In Poland’s population register
9,977 people named Niewiadomski have a registered home in Poland.
Of the 11,283 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 Masovian.
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 52 people named Niewiadomski.
15 of them were born outside France. Those born in France came from 17 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 Argentina’s national register
At least 38 people named Niewiadomski 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 Santa Fe.
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.
Who carried it
People named Niewiadomski,
with a public archive behind them.
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Wincenty Niewiadomski 1826–1892 · writer -
Wincenty Niewiadomski 1826–1892 · writer
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Stanisław Niewiadomski 1859–1936 · composer -
Stanisław Niewiadomski 1859–1936 · composer
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Eligiusz Niewiadomski 1869–1923 · writer -
Franciszek Niewiadomski 1860–1928 · lawyer
Wikidata and Wikimedia Commons (CC0).
Nearby in the index
Surnames next to Niewiadomski.
- Niemiec 2,293 · U.S. census
- Nier 437 · U.S. census
- Nierengarten 178 · U.S. census
- Nies 2,321 · U.S. census
- Niess 399 · U.S. census
- Nieto 25,701 · U.S. census
- Nigon 163 · U.S. census
- Nigra 141 · U.S. census
- Nigro 4,773 · U.S. census
- Nikolic 1,042 · U.S. census
- Nilles 1,697 · U.S. census
- Nilsson 3,223 · U.S. census
When the index is not enough
This page says where Niewiadomski 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.