What does Segnī mean in Latin?

Segnī, a proper noun, means “a Germanic tribe of Gallia Belgica, between the Eburones and Treviri, now Signei, near Condroy,”.

What is the genitive of Segnī?

The genitive singular is Segnōrum. Segnī is masculine, second declension.

In classical Latin, [ˈsɛŋ.niː]; in ecclesiastical (church) Latin, [ˈsɛɲ.ɲi].

proper noun · masculinesecond declension

Segnī m pl (genitive Segnōrum)

Classical[ˈsɛŋ.niː]Ecclesiastical[ˈsɛɲ.ɲi]

a Germanic tribe of Gallia Belgica, between the Eburones and Treviri, now Signei, near Condroy,
Segni Condrusique, ex gente et numero Germanorum, qui sunt inter Eburones Treverosque, legatos ad Caesarem miserunt oratum, ne se in hostium numero duceret neve omnium Germanorum, qui essent citra Rhenum, unam esse causam iudicaret: nihil se de bello cogitavisse, nulla Ambiorigi auxilia misisse.The Segui and Condrusi, of the nation and number of the Germans, and who are between the Eburones and the Treviri, sent embassadors to Caesar to entreat that he would not regard them in the number of his enemies, nor consider that the cause of all the Germans on this side the Rhine was one and the same; that they had formed no plans of war, and had sent no auxiliaries to Ambiorix.c. 52 BCE, Julius Caesar, Commentarii de bello Gallico 6.32

Segni, ōrum, m.,

I. a German tribe in Gallia Belgica, between the Eburones and Treviri, now Signei, near Condroy, Caes. B. G. 6, 32.