We dont know much about D but the closest we can assume it is a middle name or a hidden name.

Names with d one piece. Teach Jaguar D. Water Law Rocks D. Ace Other Carriers.

3 Also known as Straw Hat he is the main protagonist of the One Piece world. Known characters Monkey D. The manga is probably never going to address this as it doesnt fucking matter.

The Devilfruit of the first man with the will of D. Luffy Pirate King Gol D. 2Red Hair Shanks 3Monkey D.

What is even more going for this possiblity is the fact that since the D. For example the Gomu Gomu no Mi gives whoever eats it a body with rubber-like properties which is how the protagonist Monkey D. His megawatt smile and token straw hat make him one of the most recognizable One Piece characters.

Teach Whitebeard Trafalgar D. Perhaps the D kingdom is where everyone that was related had to move to because they were not welcome anywhere else. Jinbe Monkey D.

His dream is to be the Pirate King and he comes from some seriously powerful stock including higher-ups in the Revolutionary cause. Roger and some of the other characters such as Portagas D. Luffy Dragon Garp - Luffy Ancestors.