The Duplan surname
In the 2010 U.S. Census, 234 people carried this name — #80,926 among all U.S. surnames, about 1 in every 1,250,000 people counted. That is up 31% from 178 in 2000.
In France’s civil register
France’s register of deaths holds 1,202 people named Duplan.
57 of them were born outside France. Those born in France came from 69 départements, most often Hautes-Pyrénées.
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
80 people named Duplan live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Vaud.
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.
In Argentina’s national register
At least 53 people named Duplan 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.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
RENAPER (National Registry of Persons, Argentina), surnames of residents by province, December 2021 — CC BY 4.0.
Nearby in the index
Surnames next to Duplan.
- 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
- Duplain 215 · 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
- Dupoux 160 · U.S. census
When the index is not enough
This page says where Duplan 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.