User blog comment:Roranoa zoro/WILL OF THE " :-D "!!!/@comment-881083-20101224090626/@comment-1595565-20101224172359

You mean the D could mean DNA? Monkey Deoxyribo Luffy, Marshall Deoxyribo Teach, Monkey Deoxyribo Dragon.... They do have a sort of ring to them. I'm guessing that D is the first letter of the royal family's name who ruled the Ancient Kingdom during the Void Century.