This is an interesting and different way to spell Madeleine. I personally prefer Madeleine or Madeline as I think they look more elegant than Madalyn. I must admit though that this does seem the easiest and most logical way to spell the name in English.
I actually cannot believe what I am reading! Most of the comments on here are utterly ridiculous... judging a person's entire life and how successful they may or may not be depending on the spelling of their name is disgusting and downright shameful.My father chose my name and spelling and I actually think it is the most sensible and obvious way to spell it, it is spelt as it sounds.