The Siau surname
In the 2010 U.S. Census, 215 people carried this name — #86,645 among all U.S. surnames, about 1 in every 1,428,600 people counted. That is up 18% from 182 in 2000.
In France’s civil register
France’s register of deaths holds 147 people named Siau.
6 of them were born outside France. Those born in France came from 20 départements, most often Hérault.
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 Belgium’s population register
At least 87 people named Siau 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 East Flanders.
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 print
Siau in American newspapers,
1918–1930.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 23,219 pages in all carry the name.
Who carried it
People named Siau,
with a public archive behind them.
-
Isabelle Siau 1964– · miscellaneous persons without work under 60 excluding retirees
-
Keng Siau 1964– · computer scientist
Wikidata (CC0).
Nearby in the index
Surnames next to Siau.
- 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
- Sias 3,112 · U.S. census
- Sibel 135 · U.S. census
- Sibert 3,545 · U.S. census
- Sibilia 625 · U.S. census
- Sibille 278 · U.S. census
- Sibold 256 · U.S. census
- Sicard 1,947 · U.S. census
When the index is not enough
This page says where Siau 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.