The Gai surname
In the 2010 U.S. Census, 515 people carried this name — #42,163 among all U.S. surnames, about 1 in every 588,200 people counted. That is up 37% from 377 in 2000.
In France’s civil register
France’s register of deaths holds 156 people named Gai.
17 of them were born outside France. Those born in France came from 30 départements, most often Dordogne.
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 63 people named Gai 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 City of Buenos Aires.
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 Belgium’s population register
At least 56 people named Gai 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 Antwerp.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In Switzerland’s population statistics
34 people named Gai live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Zurich.
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 Gai,
with a public archive behind them.
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Antonio Gai 1686–1769 · sculptor
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Silvio Gai 1873–1967 · economist
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Silvio Gai 1873–1967 · economist
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Mario Gai 1884–1984 · civil engineer
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Mario Gai 1884–1984 · civil engineer
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Vinicio Gai 1930–2012 · musicologist
Wikidata (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Gai.
- Gagne 9,507 · U.S. census
- Gagner 1,684 · U.S. census
- Gagnet 124 · U.S. census
- Gagnier 1,180 · U.S. census
- Gagnon 21,208 · U.S. census
- Gago 670 · U.S. census
- Gaia 293 · U.S. census
- Gaida 450 · U.S. census
- Gaide 131 · U.S. census
- Gaido 133 · U.S. census
- Gail 721 · U.S. census
- Gaillard 2,566 · U.S. census
When the index is not enough
This page says where Gai 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.