The Losa surname
In the 2010 U.S. Census, 382 people carried this name — #54,055 among all U.S. surnames, about 1 in every 769,200 people counted. That is up 3% from 370 in 2000.
In Argentina’s national register
At least 296 people named Losa 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
211 people named Losa live in Switzerland.
They live in 10 of Switzerland’s 26 cantons, most of all in Ticino.
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 Poland’s population register
168 people named Losa have a registered home in Poland.
Of the 226 in Poland’s national register, these are the ones with a permanent address on file. They live in 4 of Poland’s 16 voivodeships, most of all in Silesian.
Where it concentrates, on the mapWhere they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In France’s civil register
France’s register of deaths holds 137 people named Losa.
32 of them were born outside France. Those born in France came from 28 départements, most often Paris.
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.
Who carried it
People named Losa,
with a public archive behind them.
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Václav Losa 1867–1939 · pastor -
Delia Losa Carballido 1954– · lawyer -
Isabella Losa 1473–1546
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Francisco de Losa 1536–1624 · writer
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Taurino Mariano Losa 1893–1966 · university teacher
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František Losa 1906–1957 · parson
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Losa.
When the index is not enough
This page says where Losa 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.