As the Sun God, we know him as Osiris (and in the religious science sense, Jesus is also a sun god).
As the Horned God of Fertility, we know him as Pan, Herne, Kernunnos, Frey (from very ancient times, horns have symbolised both fertility and divinity). It is probably this aspect of the God that the Christians eventually united with the Devil and Satan in their worldview, because the horny and fun-loving Pan had to be suppressed in their sexually hostile world.
As the Dark Lord, we know him as Hades and Pluto.