The Castaldo surname
In the 2010 U.S. Census, 2,222 people carried this name — #13,627 among all U.S. surnames, about 1 in every 133,300 people counted. That is up 8% from 2,055 in 2000.
Where the name comes from
The origin of the Castaldo surname
Variant of Gastaldo.
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Castaldo» (Italian), 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 271 people named Castaldo 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 132 people named Castaldo.
37 of them were born outside France. Those born in France came from 17 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.
In Switzerland’s population statistics
72 people named Castaldo live in Switzerland.
They live in 10 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 print
Castaldo in American newspapers,
1901–1924.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 174 pages in all carry the name.
Who carried it
People named Castaldo,
with a public archive behind them.
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Giovanni Battista Castaldo 1493–1563 · condottiero -
Alfonso Castaldo 1890–1966 · Catholic priest -
Alfonso Castaldo 1890–1966 · Catholic priest
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Francesco Castaldo d. 1362 · Catholic priest
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Giovanni Battista Castaldo Pescara 1586–1653 · writer
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Ercole Castaldo 1926–2006 · association football player
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Castaldo.
- Castagna 2,121 · U.S. census
- Castagne 119 · U.S. census
- Castagno 433 · U.S. census
- Castagnoli 137 · U.S. census
- Castaing 226 · U.S. census
- Castaldi 809 · U.S. census
- Castan 226 · U.S. census
- Castaner 203 · U.S. census
- Castanheira 193 · U.S. census
- Castano 6,133 · U.S. census
- Castel 711 · U.S. census
- Castelein 146 · U.S. census
When the index is not enough
This page says where Castaldo 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.