What does Manethō mean in Latin?

Manethō, a proper noun, means “An Egyptian priest of Sebennytus”.

What is the genitive of Manethō?

The genitive singular is Manethōnis. Manethō is masculine, third declension.

In classical Latin, [ˈma.nɛ.tʰoː]; in ecclesiastical (church) Latin, [ˈmaː.ne.to].

proper noun · masculinethird declension

Manethō m sg (genitive Manethōnis)

Classical[ˈma.nɛ.tʰoː]Ecclesiastical[ˈmaː.ne.to]

Manĕtho, ōnis, or Manĕthos, i, m., Μανέθων and Μανέθως,

I. a priest of Heliopolis, who wrote a history of Egypt in Greek.

Borrowed from Ancient Greek Μανεθών (Manethṓn), itself from Egyptian; see the Greek entry for possible etyma.