The Janson surname
In the 2010 U.S. Census, 3,930 people carried this name — #8,408 among all U.S. surnames, about 1 in every 75,200 people counted. That is up 2% from 3,865 in 2000.
Where the name comes from
The origin of the Janson surname
From the medieval male given name Jan + -son.
From Wiktionary, the free dictionary (en.wiktionary.org) — entry «Janson» (English), by Wiktionary contributors · licensed CC BY-SA 4.0 (creativecommons.org/licenses/by-sa/4.0) · excerpt, lightly adapted.
In France’s civil register
France’s register of deaths holds 511 people named Janson.
11 of them were born outside France. Those born in France came from 50 départements, most often Marne.
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 Poland’s population register
194 people named Janson have a registered home in Poland.
Of the 228 in Poland’s national register, these are the ones with a permanent address on file. They live in 9 of Poland’s 16 voivodeships, most of all in Łódź.
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 Argentina’s national register
At least 144 people named Janson 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.
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
36 people named Janson live in Switzerland.
They live in 6 of Switzerland’s 26 cantons, most of all in Zurich.
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/en/dataset/nachnamen-der-standigen-wohnbevolkerung-nach-kanton3 · names with fewer than 3 bearers in a canton are not published.
In Belgium’s population register
At least 24 people named Janson 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 Namur.
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.
In the Nordic population registers
911 people named Janson are counted in Sweden and Finland.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published. Finland counts its citizens, at home or abroad.
Counted, by country
Own calculations based on data from Statistics Sweden (SCB), surnames with at least two bearers, 31 December 2022 — CC BY 4.0 (names with 20 or more bearers shown) · Digital and Population Data Services Agency (DVV), Finland, surname statistics, August 2026 — CC BY 4.0.
In print
Janson in American newspapers,
1875–1911.
Chronicling America, Library of Congress — digitised newspapers in the public domain · 12,350 pages in all carry the name.
Who carried it
People named Janson,
with a public archive behind them.
-
Johannes Janson 1729–1784 · painter -
Florence Mary Janson d. 1952
-
Josephine Griselda Janson d. 2004
-
Georg F. Janson d. 1966
-
Anton Janson 1620–1687 · graphic designer
-
Joseph de Forbin Janson 1663–1728 · field officer
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Janson.
- Janky 118 · U.S. census
- Jannetta 154 · U.S. census
- Janny 134 · U.S. census
- Janowski 2,047 · U.S. census
- Jans 983 · U.S. census
- Jansen 16,596 · U.S. census
- Janssen 11,423 · U.S. census
- Janssens 557 · U.S. census
- Janton 139 · U.S. census
- Jantzen 1,590 · U.S. census
- Janus 2,172 · U.S. census
- Janusz 1,117 · U.S. census
When the index is not enough
This page says where Janson 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.