[OnlyMortal]

Well, a whole load of them did come from ancient Egypt and Babylon.

Given the Moses of Exodus came from Egypt, it’s highly unlikely he created a new script when wandering the desert. I’d imagine he had more critical issues.

Also, he was brought up as an Egyptian royal and would have been taught how to write.

It is plausible that the folks from Babylon brought their script too.

Perhaps it has origins in both.