Hi Marty,
Well here in the sunny land of Oz, essentially nothing would happen. (It always does, irrespective of the circumstances. You know, standard operating procedures for all Govt departments)
Back to reality, nothing would change or need to be changed. An individuals name is wholely unique unto itself and requires no supporting material.
I could, if I wished, run down to Hatches, Matches and Dispatchers (Registrar of Births, Deaths and Marriages) and change my name to Emily Louise Theodore Gertrude Froggmore IV, without any supporting proof or documentation. Pay the appropriate fee and I'm off.
<Note to Moderators: How do I change my name here to Emily Jane Louise Theodore Gertrude Froggmore IV? >
Speak to you after I've put the kids to bed.
Huggs
Catherine