The Rosiak surname
In the 2000 U.S. Census, 472 people carried this name — #43,157 among all U.S. surnames, about 1 in every 588,200 people counted.
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In Poland’s population register
8,685 people named Rosiak have a registered home in Poland.
Of the 9,457 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 Łódź.
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 99 people named Rosiak.
37 of them were born outside France. Those born in France came from 17 départements, most often Seine-et-Marne.
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.
Nearby in the index
Surnames next to Rosiak.
- Roser 2,111 · U.S. census
- Roses 490 · U.S. census
- Rosette 782 · U.S. census
- Rosetti 823 · U.S. census
- Rosey 142 · U.S. census
- Rosi 321 · U.S. census
- Rosier 3,759 · U.S. census
- Rosiere 206 · U.S. census
- Rosin 1,973 · U.S. census
- Rosina 126 · U.S. census
- Rosine 353 · U.S. census
- Rosinski 1,966 · U.S. census
When the index is not enough
This page says where Rosiak 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.