So why did Paul change his name from Saul?
Why didn't Simon change his name to Pimon?
Was it all just a pilly idea?
He didn't really.
As a Jew who inherited Roman citizenship from his father, he would have been given both a Hebrew and a Roman name as an infant.
His Hebrew name was
Sha'ul, which means "prayed for" and was quite a common name among his tribe of Benjamin. (The only king to ever come from that tribe bore that name.) His Roman name was
Paullus, which means "small." This was relatively common as either a Praenomen or Cognomen, particularly among the
Gens Aemilia.
He went by the name
Sha'ul among fellow Jews, both before and after becoming a Christian. When he was among Greeks he seems to have preferred being called
Paulos, the Hellenized version of his Latin name.
Some say that he preferred to use his Roman name around gentiles in order to put them at ease. I suspect that he might have had as much to do with being annoying at how horribly they mispronounced his Hebrew name; neither the Greek nor Latin languages contained the "sh" sound.
Paulos sounds a lot like
Paullus, but
Saulos doesn't actually sound very much like
Sha'ul.
Simon should actually be
Shim'on (meaning "he has heard"), but was Hellenized as like
Simeon.
Simon also happens to be a Greek name meaning "flat-nosed."
Adam and Eve should actually be Adam and
Chawa.