The Guglielmi surname
In the 2010 U.S. Census, 817 people carried this name — #29,041 among all U.S. surnames, about 1 in every 357,100 people counted. That is up 8% from 758 in 2000.
What the name means
The meaning of the Guglielmi surname
A surname originating as a patronymic.
From the personal name Guglielmo (“William”).
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Guglielmi» (Italian), by Wiktionary contributors · licensed CC BY-SA 4.0 (creativecommons.org/licenses/by-sa/4.0) · excerpt, lightly adapted.
In France’s civil register
France’s register of deaths holds 775 people named Guglielmi.
166 of them were born outside France. Those born in France came from 50 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 Argentina’s national register
At least 630 people named Guglielmi 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
75 people named Guglielmi live in Switzerland.
They live in 8 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/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 71 people named Guglielmi 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 Hainaut.
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 Guglielmi,
with a public archive behind them.
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Pietro Alessandro Guglielmi 1728–1804 · composer -
Pietro Guglielmi d. 1346 · Catholic priest
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Antonio Guglielmi 1680–1766 · Catholic priest
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Jacopo Guglielmi 1681–1742 · composer
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Pietro Carlo Guglielmi 1772–1817 · composer
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Pietro Carlo Guglielmi 1772–1804 · composer
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Guglielmi.
- Guest 9,483 · U.S. census
- Guetta 101 · U.S. census
- Guevara 46,454 · U.S. census
- Gueye 1,274 · U.S. census
- Gugenheim 109 · U.S. census
- Guglielmetti 353 · U.S. census
- Guglielmini 111 · U.S. census
- Guglielmino 235 · U.S. census
- Guglielmo 2,078 · U.S. census
- Guhl 679 · U.S. census
- Gui 479 · U.S. census
- Guibert 163 · U.S. census
When the index is not enough
This page says where Guglielmi 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.