The Leonhardt surname
In the 2010 U.S. Census, 3,491 people carried this name — #9,330 among all U.S. surnames, about 1 in every 84,700 people counted. That is up 1% from 3,458 in 2000.
In Argentina’s national register
At least 736 people named Leonhardt 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 Switzerland’s population statistics
193 people named Leonhardt live in Switzerland.
They live in 12 of Switzerland’s 26 cantons, most of all in Zurich.
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 France’s civil register
France’s register of deaths holds 158 people named Leonhardt.
19 of them were born outside France. Those born in France came from 8 départements, most often Bas-Rhin.
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 Poland’s population register
37 people named Leonhardt have a registered home in Poland.
Of the 71 in Poland’s national register, these are the ones with a permanent address on file. They live in 7 of Poland’s 16 voivodeships, most of all in Lublin.
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 the Nordic population registers
48 people named Leonhardt is counted in Sweden.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published.
Counted, by country
Own calculations based on data from Statistics Sweden (SCB), surnames with at least two bearers, 31 December 2022 — CC BY 4.0 (names with 20 or more bearers shown).
In print
Leonhardt in American newspapers,
1903–1923.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 15,269 pages in all carry the name.
Who carried it
People named Leonhardt,
with a public archive behind them.
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Adolph Leonhardt 1815–1880 · judge -
Bruno Leonhardt d. 1918
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Matheus Leonhardt d. 1721
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Conrad Leonhardt d. 1695
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Franz Joseph Leonhardt 1690–
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Maria Katharina Franziska Leonhardt 1725–
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Leonhardt.
- 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
- Leonhard 1,135 · U.S. census
- Leonhart 539 · U.S. census
- Leoni 1,083 · U.S. census
- Leonidas 250 · U.S. census
- Leonis 153 · U.S. census
- Leopold 4,411 · U.S. census
- Lepage 3,865 · U.S. census
When the index is not enough
This page says where Leonhardt 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.