Hathorne
The Irish name Deirdre was spelled Derdriu in Old Irish.
Katherine
I have seen it spelled Nathan, or Naethan; and the full name I've seen spelled Nathaniel, Nathaneil, Nathanael, Naythen, Naiithen, Naiethen.
The name Funk comes from Switzerland and Germany. It was originally spelled Funck.
Nathaniel Frey's birth name is Nathaniel Fichtenbaum.
Highly likely. Originally it must have been spelled björström.
Nathaniel Anderson's birth name is Nathaniel N Anderson.
Pili Nathaniel's birth name is Pilialoha Ku'uleiola Nathaniel.
Nathaniel Nose's birth name is Nathaniel Joseph Nose.
Nathaniel Wayne's birth name is Nathaniel Evan Wayne.
Nathaniel Kistler's birth name is Justin Nathaniel Kistler.
I don't really understand your question... 'One Direction' is the original spelling of the band's name, but it's often shortened as '1D', if that's what you meant... Or you meant which member's name is originally spelled different, than the answer is Zayn, his name is originally spelled Zain.