I find the N at the front and the extra n at the back unattractive. As if it was, I don't know, Mine Olwen as Nan is Mine Ann? Anyway, I far prefer Olwen, which is odd really because they are so close. Maybe it's just the music.
Usually I like "wen" names but not this one. I'm not sure how to describe it, other than that it reminds me of Nolan and I dislike both for the same reason. Maybe it reminds me of words like nose and mole? And it seems a little dated like Noreen? I'm not sure.