I'm pretty sure it's spent Nerevarine, there are two Rs in there.
But in any case, I don't know how Bethesda came up with the name Nerevarine, though, I'm pretty sure the in-game origins is that it comes from Nerevar, the ancient Dunmer hero the Nerevarine is supposed to be the reincarnation of, I guess in this case, the "Personrine" thing means the incarnation of said person.
I don't really know what Nazarene is supposed to be, though.