The Sainz surname
In the 2010 U.S. Census, 3,869 people carried this name — #8,511 among all U.S. surnames, about 1 in every 76,300 people counted. That is up 24% from 3,124 in 2000.
Where the name comes from
The origin of the Sainz surname
Borrowed from Spanish Sainz, itself of Basque origin.
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Sainz» (English), by Wiktionary contributors · licensed CC BY-SA 4.0 (creativecommons.org/licenses/by-sa/4.0) · excerpt, lightly adapted.
In Argentina’s national register
At least 1,910 people named Sainz 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.
Where it concentrates, on the mapWhere they live today
RENAPER (National Registry of Persons, Argentina), surnames of residents by province, December 2021 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 176 people named Sainz.
45 of them were born outside France. Those born in France came from 26 départements, most often Paris.
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 Switzerland’s population statistics
37 people named Sainz live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Vaud.
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
Sainz in American newspapers,
1910–1921.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 3,125 pages in all carry the name.
Who carried it
People named Sainz,
with a public archive behind them.
-
Francisco Sainz 1823–1853 · illustrator -
Fernando Sainz 1832–1895 · Catholic priest -
Luis Sainz 1850–1899 · painter -
Casimiro Sainz 1853–1898 · painter -
Severiano Sainz y Bencamo 1871–1937 · Catholic priest -
Gumersindo Sáinz López de Barrera 1853–1912 · jeweler
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Sainz.
- Saindon 904 · U.S. census
- Saine 1,512 · U.S. census
- Saint 1,897 · U.S. census
- Sainte 216 · U.S. census
- Saintonge 114 · U.S. census
- Saintpierre 379 · U.S. census
- Sais 1,064 · U.S. census
- Saiter 127 · U.S. census
- Saiz 4,878 · U.S. census
- Sajous 412 · U.S. census
- Saker 447 · U.S. census
- Sako 568 · U.S. census
When the index is not enough
This page says where Sainz 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.