The Folly surname
In the 2010 U.S. Census, 142 people carried this name — #121,590 among all U.S. surnames, about 1 in every 2,000,000 people counted. That is up 41% from 101 in 2000.
In Switzerland’s population statistics
306 people named Folly live in Switzerland.
They live in 11 of Switzerland’s 26 cantons, most of all in Fribourg.
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 France’s civil register
France’s register of deaths holds 159 people named Folly.
19 of them were born outside France. Those born in France came from 20 départements, most often Somme.
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.
Who carried it
People named Folly,
with a public archive behind them.
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Jean Folly 1810–1854 · judge
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Jules Folly 1846–1906 · engineer
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Gyula Mátyás Folly 1867–1915 · physician
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Gyula Folly 1911–1979 · economist
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Gyula Folly 1943–2011 · agricultural engineer
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Jean-Christophe Folly 1953– · actor
Wikidata (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Folly.
When the index is not enough
This page says where Folly 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.