The Duc surname
In the 2000 U.S. Census, 160 people carried this name — #103,706 among all U.S. surnames, about 1 in every 1,666,700 people counted.
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In France’s civil register
France’s register of deaths holds 2,954 people named Duc.
73 of them were born outside France. Those born in France came from 85 départements, most often Drôme.
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
1,421 people named Duc live in Switzerland.
They live in 12 of Switzerland’s 26 cantons, most of all in Valais.
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 Poland’s population register
587 people named Duc have a registered home in Poland.
Of the 672 in Poland’s national register, these are the ones with a permanent address on file. They live in 10 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 Belgium’s population register
At least 47 people named Duc 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 Liège.
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.
Nearby in the index
Surnames next to Duc.
When the index is not enough
This page says where Duc 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.