Anglicizations of Fionnuir (which I first saw as Fionúir) are Finora and Fennore. Other than that, I don't know any more than you do. Mostly I just wanted to be excited that you've mentioned it. I love that name (except for the meaning... eck). I wish I could remember where I came across that information!
As for Draighean, I just read that Draigean (prn. like Drain, surely one is a variant of the other) was "Wife of the legendary ancestor of the kings of Munster."