What does Būddās mean in Latin?

Būddās, a proper noun, means “The Buddha (founder of Buddhism)”.

What is the genitive of Būddās?

The genitive singular is Būddae. Būddās is masculine, first declension.

In classical Latin, [ˈbuːd.daːs]; in ecclesiastical (church) Latin, [ˈbud.das].

proper noun · masculinefirst declension

Būddās m sg (genitive Būddae)

Classical[ˈbuːd.daːs]Ecclesiastical[ˈbud.das]

The Buddha (founder of Buddhism)
Jam vidisti ne ergo quot Manis, Zoradis, aut Buddas haec docendo deceperint?c. 291 CE – 365 CE, Gaius Marius Victorinus, Contra Duo Principia Manichaeorum 7
Apud Gymnosophistas Indiae, quasi per manus hujus opinionis auctoritas traditur, quod Buddam principem dogmatis eorum, e latere suo virgo generarit.392 CE, Hieronymus, Adversus Jovinianum 1,42

Borrowed from Ancient Greek Βούδδᾱς (Boúddās, “Buddha”), from Sanskrit बुद्ध (Buddha).