The Castiglia surname
In the 2010 U.S. Census, 1,010 people carried this name — #24,702 among all U.S. surnames, about 1 in every 294,100 people counted. That is down 6% from 1,078 in 2000.
In Argentina’s national register
At least 516 people named Castiglia 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 94 people named Castiglia.
37 of them were born outside France. Those born in France came from 9 départements, most often Alpes-Maritimes.
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
51 people named Castiglia live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Zurich.
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 46 people named Castiglia 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 Castiglia,
with a public archive behind them.
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Pietro Castiglia 1808–1879 · politician -
Salvatore Castiglia 1819–1895 · diplomat -
Ferdinando Castiglia d. 1521 · Catholic priest
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Benedetto Castiglia 1811–1877 · politician
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Benedetto Castiglia 1811–1877 · politician
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Luigi Castiglia 1843– · architect
Wikidata and Wikimedia Commons (CC0).
Nearby in the index
Surnames next to Castiglia.
- Castellino 142 · U.S. census
- Castello 3,347 · U.S. census
- Castellon 8,041 · U.S. census
- Castells 164 · U.S. census
- Castellucci 671 · U.S. census
- Caster 3,208 · U.S. census
- Castiglione 2,139 · U.S. census
- Castiglioni 143 · U.S. census
- Castilla 2,071 · U.S. census
- Castille 2,821 · U.S. census
- Castillo 230,420 · U.S. census
- Castillon 1,657 · U.S. census
When the index is not enough
This page says where Castiglia 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.