http://www.sacred-texts.com/eso/sta/sta10.htmGodfrey Higgins, in his Anacalypsis, derives the name of Isis from the Hebrew ישע, Iso, and the Greek ζωω, to save. Some authorities, however, for example, Richard Payne Knight (as stated in his Symbolical Language of Ancient Art and Mythology), believe the word to be of Northern extraction, possibly Scandinavian or Gothic. In these languages the name is pronounced Isa, meaning ice, or water in its most passive, crystallized, negative state.
This Egyptian deity under many names appears as the principle of natural fecundity among nearly all the religions of the ancient world. She was known as the goddess with ten thousand appellations and was metamorphosed by Christianity into the Virgin Mary, for Isis, although she gave birth to all living things--chief among them the Sun--still remained a virgin, according to the legendary accounts.
What are the relationships between xianity and Serapis again?