The Dag surname
In the 2000 U.S. Census, 107 people carried this name — #142,819 among all U.S. surnames, about 1 in every 2,500,000 people counted.
In Switzerland’s population statistics
176 people named Dag live in Switzerland.
They live in 15 of Switzerland’s 26 cantons, most of all in Aargau.
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 172 people named Dag 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 Limburg.
Where it concentrates, on the mapWhere they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 55 people named Dag.
Most of them — 30 — were born outside France. Those born in France came from 4 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 the Nordic population registers
363 people named Dag are counted in Sweden and Finland.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published. Finland counts its citizens, at home or abroad.
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) · Digital and Population Data Services Agency (DVV), Finland, surname statistics, August 2026 — CC BY 4.0.
Who carried it
People named Dag,
with a public archive behind them.
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Leopold Dag 1867–1940
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Zeynep Dağ 1990– · fashion designer
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Zeynep Dağ 1990– · fashion designer
Wikidata (CC0).
Nearby in the index
Surnames next to Dag.
When the index is not enough
This page says where Dag 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.