I'd pronounce it like Blair unless I was corrected.
What bugs me about it is that it reminds me of the word "blare" in a way that Blair somehow does not. And since I know it means something about wind, I think of "blare" + "wind" which is a pretty abrasive image. I guess if it were pronounced to rhyme fire (is that what "Blyr" is supposed to represent?), I could see its charm because it'd sound more delicate.