The Troisi surname
In the 2000 U.S. Census, 960 people carried this name — #24,432 among all U.S. surnames, about 1 in every 277,800 people counted.
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In Switzerland’s population statistics
125 people named Troisi live in Switzerland.
They live in 15 of Switzerland’s 26 cantons, most of all in St. Gallen.
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.
In France’s civil register
France’s register of deaths holds 52 people named Troisi.
20 of them were born outside France. Those born in France came from 7 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.
Nearby in the index
Surnames next to Troisi.
- Troch 156 · U.S. census
- Troche 2,107 · U.S. census
- Troesch 229 · U.S. census
- Troester 744 · U.S. census
- Trog 104 · U.S. census
- Troia 1,290 · U.S. census
- Trojan 1,268 · U.S. census
- Trojanowski 911 · U.S. census
- Trombetta 1,603 · U.S. census
- Tromp 525 · U.S. census
- Trompeter 482 · U.S. census
- Tron 260 · U.S. census
When the index is not enough
This page says where Troisi 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.