LATIN DICTIONARYLexicon Latīnum
proper noun · masculinefirst declension

Isara

Isara m sg (genitive Isarae)

Meaning

  1. masculinesingularA river of Gallia, now Isère

Declension

declension
formsingularplural
nominativeIsara—
genitiveIsarae—
dativeIsarae—
accusativeIsaram—
ablativeIsarā—
vocativeIsara—

Ĭsăra, ae, m.,
I. a river of Gaul that falls into the Rhone, now Isère, Plin. 3, 4, 5, § 33; Planc. ap. Cic. Fam. 10, 15, 3; 10, 23, 3; Luc. 1, 399.

Origins

Borrowed from Celtic, though not originally a Celtic word; ultimately from Proto-Indo-European *isərós (“vigorous, quick”), from *eis(ə, related to Sanskrit इषिरम् (iṣiram, “fast, quick”).

In the Academy Smith's classical dictionaries

Quick answers

What does Isara mean in Latin?
Isara, a proper noun, means “A river of Gallia, now Isère”.
What is the genitive of Isara?
The genitive singular is Isarae. Isara is masculine, first declension.