The Seys surname
In the 2010 U.S. Census, 202 people carried this name — #91,221 among all U.S. surnames, about 1 in every 1,428,600 people counted. That is up 9% from 186 in 2000.
In Belgium’s population register
At least 1,120 people named Seys 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 West Flanders.
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 452 people named Seys.
23 of them were born outside France. Those born in France came from 28 départements, most often Nord.
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.
Who carried it
People named Seys,
with a public archive behind them.
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John Seys 1799–1872 · priest -
Roger Seys d. 1599 · civil servant
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Anna Theresia Seys d. 1882
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Evan Seys 1604–1685 · politician
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Anne Seys 1688–1767
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Jacobus Josephus Seys 1825–1874 · gardener
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Seys.
- Seye 249 · U.S. census
- Seyer 620 · U.S. census
- Seyfried 931 · U.S. census
- Seyler 2,102 · U.S. census
- Seyller 524 · U.S. census
- Seymour 25,436 · U.S. census
- Sferrazza 421 · U.S. census
- Sforza 884 · U.S. census
- Sgro 1,165 · U.S. census
- Shaw 160,400 · U.S. census
- Siam 363 · U.S. census
- Siano 1,112 · U.S. census
When the index is not enough
This page says where Seys 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.