The Riou surname
In the 2000 U.S. Census, 104 people carried this name — #146,011 among all U.S. surnames, about 1 in every 2,500,000 people counted.
Free to read. No account, no sign-up.
In France’s civil register
France’s register of deaths holds 8,089 people named Riou.
61 of them were born outside France. Those born in France came from 93 départements, most often Finistère.
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 Switzerland’s population statistics
51 people named Riou live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Vaud.
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 Riou.
- Ringwald 768 · U.S. census
- Rinn 951 · U.S. census
- Rinner 316 · U.S. census
- Rio 1,458 · U.S. census
- Rion 639 · U.S. census
- Rios 96,569 · U.S. census
- Rioux 2,584 · U.S. census
- Ripoll 485 · U.S. census
- Ripp 1,615 · U.S. census
- Rippe 1,066 · U.S. census
- Rippert 203 · U.S. census
- Ripplinger 872 · U.S. census
When the index is not enough
This page says where Riou 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.