The Decocq surname
In the 2010 U.S. Census, 109 people carried this name — #150,452 among all U.S. surnames, about 1 in every 2,500,000 people counted. That is down 8% from 118 in 2000.
In France’s civil register
France’s register of deaths holds 261 people named Decocq.
9 of them were born outside France. Those born in France came from 14 départements, most often Pas-de-Calais.
Where it concentrates, on the mapWhere 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 61 people named Decocq 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 Liège.
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.
Who carried it
People named Decocq,
with a public archive behind them.
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Petrus Decocq 1870–1931
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André Decocq 1932–2019 · jurist
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Christian Decocq 1945– · politician
Wikidata (CC0).
Nearby in the index
Surnames next to Decocq.
- Decker 56,576 · U.S. census
- Deckers 136 · U.S. census
- Deckert 2,274 · U.S. census
- Declerck 485 · U.S. census
- Declercq 618 · U.S. census
- Decock 423 · U.S. census
- Deconinck 195 · U.S. census
- Decorte 541 · U.S. census
- Decory 175 · U.S. census
- Decosse 185 · U.S. census
- Decoster 1,084 · U.S. census
- Decot 174 · U.S. census
When the index is not enough
This page says where Decocq 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.