The Petronio surname
In the 2010 U.S. Census, 430 people carried this name — #48,995 among all U.S. surnames, about 1 in every 666,700 people counted. That is up 5% from 408 in 2000.
In Argentina’s national register
At least 242 people named Petronio 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 72 people named Petronio.
24 of them were born outside France. Those born in France came from 15 départements, most often Bouches-du-Rhône.
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
46 people named Petronio 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/en/dataset/nachnamen-der-standigen-wohnbevolkerung-nach-kanton3 · names with fewer than 3 bearers in a canton are not published.
In Belgium’s population register
At least 27 people named Petronio 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 Namur.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
Who carried it
People named Petronio,
with a public archive behind them.
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Francesco Petronio 1840–1895 · physician -
Renato Petronio 1891–1976 · coxswain -
Renato Petronio 1891–1976 · coxswain
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Francesco Petronio 1837–1926
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Fortunata Morpurgo 1872–1956 · writer
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Fortunata Morpurgo 1872–1956 · writer
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Petronio.
- Petro 5,777 · U.S. census
- Petrocchi 120 · U.S. census
- Petroff 2,018 · U.S. census
- Petron 431 · U.S. census
- Petrone 3,854 · U.S. census
- Petroni 327 · U.S. census
- Petrou 369 · U.S. census
- Petrov 2,129 · U.S. census
- Petrovic 1,895 · U.S. census
- Petrovitch 120 · U.S. census
- Petrucci 3,012 · U.S. census
- Petrus 2,100 · U.S. census
When the index is not enough
This page says where Petronio 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.