NICKNAMES OF PERSONS
Put a nickname within quotation marks or parentheses on its first appearance:
Michael "Nick" Nichols
Capt. E. J. "Scotty" Gall
or Capt. E. J. (Scotty) Gall
Walter J. (Wally) Hickel showed me his trophies.
Wally told me ...
When the nickname is well-known, the given name need not appear at all, nor are quotation marks necessary:
Babe Ruth
Butch Cassidy
Billy the Kid
See also TITLES OF PERSONS.