The Seneca surname
In the 2010 U.S. Census, 851 people carried this name — #28,131 among all U.S. surnames, about 1 in every 344,800 people counted. That is up 4% from 816 in 2000.
In France’s civil register
France’s register of deaths holds 191 people named Seneca.
15 of them were born outside France. Those born in France came from 25 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 Belgium’s population register
At least 46 people named Seneca 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 Hainaut.
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 Argentina’s national register
At least 37 people named Seneca 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.
Nearby in the index
Surnames next to Seneca.
- Senat 807 · U.S. census
- Senatore 896 · U.S. census
- Senay 402 · U.S. census
- Sender 719 · U.S. census
- Sendra 396 · U.S. census
- Sene 555 · U.S. census
- Senecal 2,575 · U.S. census
- Senechal 575 · U.S. census
- Senesi 142 · U.S. census
- Seng 4,563 · U.S. census
- Sengel 107 · U.S. census
- Senger 2,435 · U.S. census
When the index is not enough
This page says where Seneca 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.