The Castro surname
In the 2000 U.S. Census, 133,254 people carried this name — #194 among all U.S. surnames, about 1 in every 2,020 people counted.
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In Switzerland’s population statistics
2,017 people named Castro live in Switzerland.
They live in 25 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 · names with fewer than 3 bearers in a canton are not published.
In France’s civil register
France’s register of deaths holds 1,138 people named Castro.
554 of them were born outside France. Those born in France came from 72 départements, most often Pyrénées-Atlantiques.
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 Belgium’s population register
At least 375 people named Castro 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 Limburg.
Where it concentrates, on the mapWhere they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In print
Castro in American newspapers,
1902–1961.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 195,521 pages in all carry the name.
Who carried it
People named Castro,
with a public archive behind them.
-
João de Castro 1500–1548 · military personnel -
Isaac Orobio de Castro 1617–1687 · writer -
Joaquim Machado de Castro 1731–1822 · artist -
Gomes Freire de Andrade 1757–1817 · military officer -
Domitila de Castro, Marchioness of Santos 1797–1867
Wikidata and Wikimedia Commons (CC0) · 138 lives in all are documented under this name.
Nearby in the index
Surnames next to Castro.
- Castilla 1,638 · U.S. census
- Castille 2,689 · U.S. census
- Castillo 165,473 · U.S. census
- Castillon 1,293 · U.S. census
- Castin 158 · U.S. census
- Castor 5,331 · U.S. census
- Castronovo 594 · U.S. census
- Casula 155 · U.S. census
- Cat 189 · U.S. census
- Catala 704 · U.S. census
- Catalan 4,173 · U.S. census
- Catalano 9,671 · U.S. census
When the index is not enough
This page says where Castro 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.