I pronounce
Layla and
Leila the same (LAY-la). I think I like
Leila better, it seems more refreshing to me and
Layla seems a little boring- I'm also not too fond of names with "ay" in them.
I pronounce
Leyla,
Laila, and Lejla like LAY-la and Lyla,
Lila, Lilah, and Lylah like LYE-la. (although I always want to say
Lila like LEE-la).