After taking a couple items from 'bag of discarded things' in the Ark, the name on my zurkhwood ring changed to that of a body of a dead PC laying nearby. Halfbrood gave me a new ring with my PC's name on it again. But there may be some bug with bodies laying near that discard bag???
Are you sure you just didn't get confused and pick up the dead PC's ring?
The ring was on my finger, and I only had one ring after the name changed (and it wasn't my PC's name any longer).