The Declercq surname
In the 2010 U.S. Census, 618 people carried this name — #36,246 among all U.S. surnames, about 1 in every 476,200 people counted. That is up 31% from 472 in 2000.
Where the name comes from
The origin of the Declercq surname
Borrowed from Dutch Declercq, an alternative form of de Klerk.
From Wiktionary, the free dictionary — entry «Declercq» (English), by Wiktionary contributors · CC BY-SA 4.0 · excerpt, lightly adapted.
In Belgium’s population register
At least 6,057 people named Declercq 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 West Flanders.
Where it concentrates, on the mapWhere they live today
Statbel (Statistics Belgium), family names of the population by municipality, 1 January 2026 — CC BY 4.0.
In France’s civil register
France’s register of deaths holds 1,942 people named Declercq.
119 of them were born outside France. Those born in France came from 48 départements, most often Nord.
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 Argentina’s national register
At least 42 people named Declercq 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 Santa Fe.
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
29 people named Declercq live in Switzerland.
They live in 3 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 · names with fewer than 3 bearers in a canton are not published.
Nearby in the index
Surnames next to Declercq.
- Dechene 267 · U.S. census
- Deck 5,668 · U.S. census
- Decker 56,576 · U.S. census
- Deckers 136 · U.S. census
- Deckert 2,274 · U.S. census
- Declerck 485 · U.S. census
- Decock 423 · U.S. census
- Decocq 109 · U.S. census
- Deconinck 195 · U.S. census
- Decorte 541 · U.S. census
- Decory 175 · U.S. census
- Decosse 185 · U.S. census
When the index is not enough
This page says where Declercq 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.