The Dec surname
In the 2010 U.S. Census, 979 people carried this name — #25,295 among all U.S. surnames, about 1 in every 303,000 people counted. That is up 3% from 955 in 2000.
In Poland’s population register
7,321 people named Dec have a registered home in Poland.
Of the 8,040 in Poland’s national register, these are the ones with a permanent address on file. They live in all 16 of Poland’s voivodeships, most of all in Subcarpathian.
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 77 people named Dec.
29 of them were born outside France. Those born in France came from 18 départements, most often Pas-de-Calais.
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 Argentina’s national register
At least 70 people named Dec 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 Belgium’s population register
At least 27 people named Dec 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.
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 Switzerland’s population statistics
25 people named Dec live in Switzerland.
They live in 5 of Switzerland’s 26 cantons, most of all in Basel-Landschaft.
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 the Nordic population registers
39 people named Dec is counted in Sweden.
Sweden’s figure is from 31 December 2022, the last count Statistics Sweden published.
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).
Who carried it
People named Dec,
with a public archive behind them.
-
Władysław Dec 1898–1965 · teacher -
Francis E. Dec 1926–1996 · lawyer -
Stanisław Dec 1862–1943 · architect
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Władysław Dec 1907–1999 · chaplain
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Lechosław Dec 1924–1994 · physician
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Irena Laudańska-Dec 1924–2007 · conservator
Wikidata and Wikimedia Commons (CC0) · 10 lives in all are documented under this name.
Nearby in the index
Surnames next to Dec.
- Debry 185 · U.S. census
- Debs 385 · U.S. census
- Debski 443 · U.S. census
- Debuck 189 · U.S. census
- Debus 729 · U.S. census
- Debusschere 211 · U.S. census
- Decamp 2,601 · U.S. census
- Decamps 128 · U.S. census
- Decan 112 · U.S. census
- Decanter 164 · U.S. census
- Decelle 521 · U.S. census
- Dechaine 413 · U.S. census
When the index is not enough
This page says where Dec 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.