The Rosier surname
In the 2000 U.S. Census, 3,759 people carried this name — #8,124 among all U.S. surnames, about 1 in every 71,900 people counted.
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In France’s civil register
France’s register of deaths holds 2,425 people named Rosier.
46 of them were born outside France. Those born in France came from 93 départements, most often Rhône.
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 Belgium’s population register
At least 405 people named Rosier 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 Hainaut.
Where it concentrates, on the mapWhere they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In Switzerland’s population statistics
25 people named Rosier live in Switzerland.
They live in 4 of Switzerland’s 26 cantons, most of all in Geneva.
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 · names with fewer than 3 bearers in a canton are not published.
Nearby in the index
Surnames next to Rosier.
- 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
- Rosiak 472 · 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
- Roso 326 · U.S. census
When the index is not enough
This page says where Rosier 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.