In Reply to: Here's the lyrics posted by Perry on February 11, 2005 at 20:26:30:
"Rhiannon is the name of a Welsh goddess. According to myth, Rhiannon shuns a God and marries a mortal man. That God then frames her for the murder of her own son, and she is forced to stand at the entrance to a city and tell everyone entering that she killed her child."
That is from this website http://www.songfacts.com/detail.lasso?id=1887
There are other very interesting facts about this particular song at that link.
I don't think it would be too much of a stretch to think that Zerby simply chose a variation of that goddess' name, knowing how much they're into that sort of thing. She surely would have put a lot of thought and prayer into something as serious as a legal name change.