The Illi surname
In the 2010 U.S. Census, 113 people carried this name — #146,201 among all U.S. surnames, about 1 in every 2,500,000 people counted. That is down 5% from 119 in 2000.
In Switzerland’s population statistics
550 people named Illi live in Switzerland.
They live in 20 of Switzerland’s 26 cantons, most of all in Zurich.
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 50 people named Illi.
6 of them were born outside France. Those born in France came from 10 départements, most often Vaucluse.
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 Argentina’s national register
At least 21 people named Illi 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.
In the Nordic population registers
134 people named Illi is counted in Finland.
Finland counts its citizens, at home or abroad.
Counted, by country
Digital and Population Data Services Agency (DVV), Finland, surname statistics, August 2026 — CC BY 4.0.
Who carried it
People named Illi,
with a public archive behind them.
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Ernst Illi 1903–1992 · politician
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Aleksander Illi 1912–2000 · civil servant
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Aleksander Illi 1912–2000 · civil servant
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Kurt H. Illi 1935–2010
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Esko Illi 1945– · naval officer
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Günther Illi 1950– · film score composer
Wikidata (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Illi.
When the index is not enough
This page says where Illi 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.