Adrian Conan Doyle's birth name is Adrian Malcolm Conan Doyle.
Jean Conan Doyle's birth name is Jean Lena Annette Conan Doyle.
The name on his birth certificate is Arthur Ignatius Conan Doyle, and he never changed it. He played football (soccer) goalie using the name A. C. Smith, but that is not a real name change. He was awarded a knighthood in 1902, but that is not a name change either.
Sir Arthur Ignatius Conan Doyle. By the way, it is not proper to refer to him as Doyle or Arthur C. Doyle.
Julian Doyle's birth name is Julian Doyle.
Mimi Doyle's birth name is Patricia Doyle.
Adrian Devane's birth name is Adrian Joseph Devane.
Doyle Rockwell's birth name is Doyle Craig Rockwell.
Doyle Alexander's birth name is Doyle Lafayette Alexander.
Denny Doyle's birth name is Robert Dennis Doyle.
Regina Doyle's birth name is Regina Alice Doyle.
Summer Doyle's birth name is Summer Ryan Doyle.
Doyle Cooper's birth name is Doyle B. Cooper.