The Cos surname
In the 2010 U.S. Census, 440 people carried this name — #48,060 among all U.S. surnames, about 1 in every 666,700 people counted. That is up 37% from 321 in 2000.
In Argentina’s national register
At least 609 people named Cos 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 77 people named Cos.
8 of them were born outside France. Those born in France came from 13 départements, most often Ille-et-Vilaine.
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 Poland’s population register
60 people named Cos have a registered home in Poland.
Of the 65 in Poland’s national register, these are the ones with a permanent address on file. They live in 5 of Poland’s 16 voivodeships, most of all in Holy Cross.
Too few records to say where it concentrates region by region — these are plain counts, not shares.
Where they live today
PESEL register, Ministry of Digital Affairs of Poland (dane.gov.pl) — CC0 · living people by voivodeship of permanent residence, 20 January 2026.
In print
Cos in American newspapers,
1906–1924.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 3,115,004 pages in all carry the name.
Nearby in the index
Surnames next to Cos.
- Corti 435 · U.S. census
- Cortijo 518 · U.S. census
- Cortina 3,031 · U.S. census
- Cortopassi 435 · U.S. census
- Corvi 283 · U.S. census
- Corvo 373 · U.S. census
- Cosentino 4,312 · U.S. census
- Cosenza 1,860 · U.S. census
- Coskun 208 · U.S. census
- Cosma 543 · U.S. census
- Cosme 5,405 · U.S. census
- Cossa 196 · U.S. census
When the index is not enough
This page says where Cos 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.