@marsha – It’s definitely interesting! I’ve got Morgan’s book about Celtic Fair Folk and I just haven’t had a chance to make my way through it. I don’t personally work with fairies or the Fae, and I don’t believe I’ve had experiences with them myself. Maybe one day when I make it to Ireland my experience will be different!
@BryWisteria – I’ve heard mixed things about Celtic fairies and where they will or won’t be. Some things make sense, like certain Fae-entities that are directly related to certain places. And then others, like the Bean Sí 
A Herald of Death, are directly tied to familial lines. It’s something to ponder, for sure!
I also wouldn’t classify sirens or nymphs to be fairies or Fae. They’re more of a land spirit, in my opinion. And then it’s even more complicated to think about when you consider the fact that what we know as the Irish Fair Folk used to be the Gods of the land before the Milesians (I think? I could be wrong on that one) invaded and forced them underground. I agree with Morgan that it would be hubristic to think I could tell a God or powerful entity where they should and shouldn’t go. 