The Leonardi surname
In the 2010 U.S. Census, 1,834 people carried this name — #15,864 among all U.S. surnames, about 1 in every 161,300 people counted. That is down 18% from 2,241 in 2000.
Where the name comes from
The origin of the Leonardi surname
From Italian Leonardi, from Leonardo.
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Leonardi» (English), by Wiktionary contributors · licensed CC BY-SA 4.0 (creativecommons.org/licenses/by-sa/4.0) · excerpt, lightly adapted.
In Argentina’s national register
At least 2,287 people named Leonardi 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 729 people named Leonardi.
190 of them were born outside France. Those born in France came from 51 départements, most often Corsica.
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
424 people named Leonardi live in Switzerland.
They live in 18 of Switzerland’s 26 cantons, most of all in Ticino.
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/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 Leonardi 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 Liège.
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.
In Poland’s population register
20 people named Leonardi have a registered home in Poland.
Of the 42 in Poland’s national register, these are the ones with a permanent address on file. They live in 4 of Poland’s 16 voivodeships, most of all in Lower Silesian.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In print
Leonardi in American newspapers,
1889–1942.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 5,694 pages in all carry the name.
Who carried it
People named Leonardi,
with a public archive behind them.
-
Camillo Leonardi 1500–1600 · astronomer -
Giovanni Leonardi 1541–1609 · Catholic priest -
Pietro Leonardi 1769–1844 · priest -
Demetrio Leonardi 1796–1881 · scientist -
Pasquale Leonardi Cattolica 1854–1924 · politician
Wikidata and Wikimedia Commons (CC0) · 194 lives in all are documented under this name.
Nearby in the index
Surnames next to Leonardi.
- Lenz 11,191 · U.S. census
- Lenzi 1,232 · U.S. census
- Lenzini 183 · U.S. census
- Leo 8,039 · U.S. census
- Leon 86,363 · U.S. census
- Leonard 91,475 · U.S. census
- Leonardo 6,007 · U.S. census
- Leonce 233 · U.S. census
- Leoncini 118 · U.S. census
- Leone 15,364 · U.S. census
- Leonelli 347 · U.S. census
- Leonetti 1,646 · U.S. census
When the index is not enough
This page says where Leonardi 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.