Apocrypha or church father writings or folk tales etc don't carry any weight for JW's, as I'm sure you know.
And it came to pass, as her soul was in departing, (for she died) that she called his name Benoni: but his father called him Benjamin. - Gen 35: 18
I don't see any mention of it, or any concept here. She called him a different name to his father? Either on her death bed or before?
he went and preached unto the spirits in prisonโ (hell) and then he raised himself from the deadโฆ. while he was dead.
Preaching to angels or spirit creatures?