Siamese Dream
Registered User
It seems like a stretch that the books will have the real Aegon, a fake Aegon, and then an Aegon #2. I think it's more likely Jon's real name in the books is something else.
I think in the books it's most likely he has no name at all other than Jon, the name Ned gave him. We don't really know how long Lyanna was alive after his birth but I think it's possible she might not have had time to name him and would have been too preoccupied with the pain of dying (or maybe high on milk of the poppy if she was given it) I doubt it would have been like in Star Wars when a dying Padme gets presented with the babies and names them on the spot. (It's probably also worth mentioning that we're told Wildlings wait before they name their babies, so this opens up the possibility that Lyanna didn't have time to give him a name)