The Blau surname
In the 2010 U.S. Census, 2,965 people carried this name — #10,758 among all U.S. surnames, about 1 in every 99,000 people counted. That is up 11% from 2,674 in 2000.
In France’s civil register
France’s register of deaths holds 155 people named Blau.
18 of them were born outside France. Those born in France came from 29 départements, most often Moselle.
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 88 people named Blau 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 Córdoba.
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 Switzerland’s population statistics
86 people named Blau live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Bern.
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.
In print
Blau in American newspapers,
1911–1929.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 67,115 pages in all carry the name.
Who carried it
People named Blau,
with a public archive behind them.
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Édouard Blau 1836–1906 · writer -
Andreas Blau 1500–1600 · entrepreneur
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Felix Anton Blau 1754–1798 · politician
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Alfred Blau 1827–1896 · playwright
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Otto Blau 1828–1879 · diplomat
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Friedrich Blau 1830–1899 · writer
Wikidata and Wikimedia Commons (CC0) · 9 lives in all are documented under this name.
Nearby in the index
Surnames next to Blau.
- Blasquez 218 · U.S. census
- Blaszczyk 643 · U.S. census
- Blatt 4,020 · U.S. census
- Blatter 828 · U.S. census
- Blattner 1,371 · U.S. census
- Blatz 644 · U.S. census
- Blay 1,229 · U.S. census
- Blazi 103 · U.S. census
- Blazquez 268 · U.S. census
- Bleau 1,309 · U.S. census
- Blech 311 · U.S. census
- Bleicher 484 · U.S. census
When the index is not enough
This page says where Blau 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.