The Koscielny surname
In the 2010 U.S. Census, 178 people carried this name — #101,247 among all U.S. surnames, about 1 in every 1,666,700 people counted. That is up 8% from 165 in 2000.
In Poland’s population register
1,917 people named Koscielny have a registered home in Poland.
Of the 2,173 in Poland’s national register, these are the ones with a permanent address on file. They live in 15 of Poland’s 16 voivodeships, most of all in Silesian.
Where it concentrates, on the mapWhere 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 France’s civil register
France’s register of deaths holds 56 people named Koscielny.
15 of them were born outside France. Those born in France came from 14 départements, most often Nord.
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 print
Koscielny in American newspapers,
1921.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 3,349 pages in all carry the name.
Nearby in the index
Surnames next to Koscielny.
- Korn 5,442 · U.S. census
- Korner 527 · U.S. census
- Kornmann 180 · U.S. census
- Kos 1,669 · U.S. census
- Koscher 136 · U.S. census
- Koscielniak 508 · U.S. census
- Kosinski 2,646 · U.S. census
- Koslowski 705 · U.S. census
- Kosmala 279 · U.S. census
- Kosowski 572 · U.S. census
- Kost 3,522 · U.S. census
- Koster 6,580 · U.S. census
When the index is not enough
This page says where Koscielny 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.