The Duplain surname
In the 2010 U.S. Census, 215 people carried this name — #86,645 among all U.S. surnames, about 1 in every 1,428,600 people counted. That is up 14% from 189 in 2000.
In France’s civil register
France’s register of deaths holds 171 people named Duplain.
3 of them were born outside France. Those born in France came from 14 départements, most often Loire.
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
89 people named Duplain live in Switzerland.
They live in 7 of Switzerland’s 26 cantons, most of all in Neuchâtel.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where 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.
Who carried it
People named Duplain,
with a public archive behind them.
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Benoît Duplain 1711–1774 · bookseller
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Albert Duplain 1890–1978 · artist
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Ami-Ferdinand Duplain 1893–1966 · editor-in-chief
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Georges Duplain 1914–1993 · writer
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Claude Duplain 1954– · politician
Wikidata (CC0).
Nearby in the index
Surnames next to Duplain.
- Dupas 433 · U.S. census
- Dupere 304 · U.S. census
- Duperon 194 · U.S. census
- Duperron 222 · U.S. census
- Dupey 224 · U.S. census
- Dupin 558 · U.S. census
- Duplan 234 · U.S. census
- Duplantier 356 · U.S. census
- Duplessis 3,044 · U.S. census
- Duplessy 181 · U.S. census
- Dupon 131 · U.S. census
- Dupont 10,339 · U.S. census
When the index is not enough
This page says where Duplain 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.