The Castillo surname
In the 2010 U.S. Census, 230,420 people carried this name — #93 among all U.S. surnames, about 1 in every 1,280 people counted. That is up 39% from 165,473 in 2000.
What the name means
The meaning of the Castillo surname
A habitational surname from Spanish, from Spanish castillo (“castle”).
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Castillo» (English), 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 130,028 people named Castillo 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 1,087 people named Castillo.
472 of them were born outside France. Those born in France came from 64 départements, most often Pyrénées-Orientales.
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 Switzerland’s population statistics
900 people named Castillo live in Switzerland.
They live in 21 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/en/dataset/nachnamen-der-standigen-wohnbevolkerung-nach-kanton3 · names with fewer than 3 bearers in a canton are not published.
In the Nordic population registers
242 people named Castillo is counted in Sweden.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published.
Counted, by country
Own calculations based on data from Statistics Sweden (SCB), surnames with at least two bearers, 31 December 2022 — CC BY 4.0 (names with 20 or more bearers shown).
In print
Castillo in American newspapers,
1895–1961.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 87,007 pages in all carry the name.
Who carried it
People named Castillo,
with a public archive behind them.
-
João de Castilho 1470–1552 · architect -
Francisco Castillo de la Concha 1598–1685 · politician -
Mariano Castillo y Ocsiero 1821–1875 · astrologer -
Aurelia Castillo de González 1842–1920 · writer -
Demetrio Castillo Duany 1856–1922 · military personnel
Wikidata and Wikimedia Commons (CC0) · 184 lives in all are documented under this name.
Nearby in the index
Surnames next to Castillo.
- Caster 3,208 · U.S. census
- Castiglia 1,010 · 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
- Castillon 1,657 · U.S. census
- Castin 203 · U.S. census
- Castor 6,063 · U.S. census
- Castro 184,134 · U.S. census
- Castronovo 629 · U.S. census
- Casula 174 · U.S. census
When the index is not enough
This page says where Castillo 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.