LATIN DICTIONARYLexicon Latīnum
proper noun · masculinethird declension

Īnsubrēs

Īnsubrēs m pl (genitive Īnsubrium or Īnsubrum)
Classical[ˈĩː.sʊ.breːs]Ecclesiastical[ˈin.su.bres]

Meaning

  1. A tribe who dwelt both in Gallia Transalpina and Gallia Cisalpina

Declension

declension
formsingularplural
nominative—Īnsubrēs
genitive—Īnsubrium
Īnsubrum
dative—Īnsubribus
accusative—Īnsubrēs
Īnsubrīs
ablative—Īnsubribus
vocative—Īnsubrēs

Insŭbres, v. Insuber.

Origins

Of uncertain origin, but thought to be a Pre-Celtic substrate name adapted by Celts or Romans. Archaeology suggests the Insubres emerged from a fusion of local Ligurian and Celtic elements in northern Italy, which may mean the name was carried over from a non‑Celtic local language that was later reinterpreted in Latin by analogy to Latin or Greek ethnonyms. Roman folk etymology (from writers such as Livy) interpreted the name as something like Gaulish *Isombres, possibly meaning "lower Umbrians," from Proto-Celtic *en + Umbri; also compare the tribe Ambrones.

In the Academy Smith's classical dictionaries

Quick answers

What does Īnsubrēs mean in Latin?
Īnsubrēs, a proper noun, means “A tribe who dwelt both in Gallia Transalpina and Gallia Cisalpina”.
What is the genitive of Īnsubrēs?
The genitive singular is Īnsubrium. Īnsubrēs is masculine, third declension.
How do you pronounce Īnsubrēs?
In classical Latin, [ˈĩː.sʊ.breːs]; in ecclesiastical (church) Latin, [ˈin.su.bres].