The Calo surname
In the 2010 U.S. Census, 1,908 people carried this name — #15,370 among all U.S. surnames, about 1 in every 153,800 people counted. That is up 22% from 1,558 in 2000.
In Argentina’s national register
At least 1,591 people named Calo 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 Switzerland’s population statistics
236 people named Calo live in Switzerland.
They live in 15 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 France’s civil register
France’s register of deaths holds 148 people named Calo.
54 of them were born outside France. Those born in France came from 11 départements, most often Morbihan.
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 Belgium’s population register
At least 65 people named Calo 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.
In print
Calo in American newspapers,
1898–1929.
Chronicling America, Library of Congress — digitised newspapers in the public domain.
Who carried it
People named Calo,
with a public archive behind them.
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Daniel Calo 1662–1691 · teacher
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Rodolfo Calo 1909–1964 · politician
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Masha Calo 1935–2019 · writer
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Seraphin B. Calo 1947– · computer scientist
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Francisco Calo Lourido 1948– · historian
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Teresa Calo 1955– · screenwriter
Wikidata (CC0) · 9 lives in all are documented under this name.
Nearby in the index
Surnames next to Calo.
- Callier 1,540 · U.S. census
- Callies 1,177 · U.S. census
- Callo 363 · U.S. census
- Callon 301 · U.S. census
- Calmes 1,009 · U.S. census
- Calmus 106 · U.S. census
- Calon 113 · U.S. census
- Calone 116 · U.S. census
- Calonge 314 · U.S. census
- Caltagirone 532 · U.S. census
- Calvani 179 · U.S. census
- Calvary 178 · U.S. census
When the index is not enough
This page says where Calo 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.