The Duca surname
In the 2010 U.S. Census, 1,314 people carried this name — #20,248 among all U.S. surnames, about 1 in every 222,200 people counted. That is up 3% from 1,275 in 2000.
In Argentina’s national register
At least 915 people named Duca 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 178 people named Duca.
65 of them were born outside France. Those born in France came from 29 départements, most often Moselle.
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
165 people named Duca live in Switzerland.
They live in 12 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 Belgium’s population register
At least 63 people named Duca 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 Brussels-Capital.
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 the Nordic population registers
39 people named Duca 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).
Who carried it
People named Duca,
with a public archive behind them.
-
Gheorghe Duca 1847–1899 · engineer -
Francesco Borgongini Duca 1884–1954 · nuncio -
Francesco Borgongini Duca 1884–1954 · nuncio
-
Giovanni Duca 1896–1944 · military personnel -
Anastasia Duca 1631–1703
-
Anastasia Duca 1635–1703
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Duca.
When the index is not enough
This page says where Duca 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.