My first thought was Marie! I love Hayley Nicole, Hayley Rose, Hayley Grace too.
I have a Hayley in my class I will find out her middle name on Tuesday for you!!
A loooong time ago I taught Yr2 and it was 7 years after Haleys comet had been seen so I had 3 Hayleys in my class but all spelt differently.
My little one is Hayley Bridget , we had a few options being: Hayley Briana , Hayley Elizabeth..
But i have to say from all the other posts i think Hayley Rose is also beautiful.
Good Luck
... oooh i'm gonna throw a spanner in the works here as i'm not keen on a middle name with a ' y ' in it, looks too matchy or a little odd with Hayley IYKWIM
so funny as i first name came to mind was Hayley Kate too
i feel like i wanna put a middle name with ' a ' ending in it with Hayley
i absolutely love Dido's suggestion " Hayley Briana " (and spelt that way) (i was thinking Breeanna or Breeana too but it looks too long next to Hayley)
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