The Claessens surname
In the 2000 U.S. Census, 143 people carried this name — #113,519 among all U.S. surnames, about 1 in every 2,000,000 people counted.
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In Belgium’s population register
At least 4,423 people named Claessens 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 Antwerp.
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 146 people named Claessens.
34 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 Switzerland’s population statistics
35 people named Claessens 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 Claessens.
- Citti 140 · U.S. census
- Ciucci 284 · U.S. census
- Civil 594 · U.S. census
- Clady 284 · U.S. census
- Claerhout 159 · U.S. census
- Claes 263 · U.S. census
- Claeys 1,344 · U.S. census
- Clain 178 · U.S. census
- Clair 4,520 · U.S. census
- Claire 1,099 · U.S. census
- Clar 365 · U.S. census
- Clara 1,045 · U.S. census
When the index is not enough
This page says where Claessens 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.