The Simo surname
In the 2010 U.S. Census, 1,097 people carried this name — #23,238 among all U.S. surnames, about 1 in every 270,300 people counted. That is up 26% from 868 in 2000.
In Argentina’s national register
At least 474 people named Simo 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 Buenos Aires Province.
Where it concentrates, on the mapWhere they live today
RENAPER (National Registry of Persons, Argentina), surnames of residents by province, December 2021 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 192 people named Simo.
64 of them were born outside France. Those born in France came from 32 départements, most often Gard.
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 Switzerland’s population statistics
35 people named Simo live in Switzerland.
They live in 5 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 Simo.
- Simic 814 · U.S. census
- Simion 304 · U.S. census
- Simione 305 · U.S. census
- Simler 542 · U.S. census
- Simmer 917 · U.S. census
- Simmons 210,182 · U.S. census
- Simoens 150 · U.S. census
- Simoes 2,203 · U.S. census
- Simon 80,460 · U.S. census
- Simoncelli 249 · U.S. census
- Simoncini 319 · U.S. census
- Simone 7,221 · U.S. census
When the index is not enough
This page says where Simo 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.