The Riat surname
In the 2000 U.S. Census, 121 people carried this name — #129,619 among all U.S. surnames, about 1 in every 2,500,000 people counted.
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In Switzerland’s population statistics
291 people named Riat live in Switzerland.
They live in 8 of Switzerland’s 26 cantons, most of all in Jura.
Where it concentrates, on the mapWhere 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.
In France’s civil register
France’s register of deaths holds 108 people named Riat.
18 of them were born outside France. Those born in France came from 17 départements, most often Nièvre.
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 Riat.
When the index is not enough
This page says where Riat 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.