Would Leigh Brackett's 1953 Sci-Fi/Fantasy novel The Sword of Rhiannon have anything to do with it?
I have a mint condition copy of The Sword of Rhiannon as it was the second Sci-Fi book I every read. First was Robert Anson Heinlein's Citizen of the Galaxy.
Those two made me a Sci-Fi fan till death... And beyond!
Rhiannon is a Welsh name and used by Leigh Brackett and others. My horse is named that so I used her name since it is not so common. I am a SCIFI fan and am a regular at the Baen website.