Read this article to find the meaning of the initial D. in Luffy's name in One Piece and the mystery behind the Will of D.
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One Piece Theory: The 'D' In Luffy's Name Isn't What You Think
Has Luffy ever questioned the D in his name, and why do other people have a D in their name? - Quora
Will of D - New Theory : r/OnePiece
One Piece Star Iñaki Godoy Has an Absurd Idea of What the D in His Iconic Character's Name Stands For
What is the meaning of 'D' in One Piece? Why is it so important in the plot of the manga? - Quora
Was rereading one piece and found this. It is amazing to think that Oda had The will of D planned from as far back as volume 8 : r/OnePiece
The Mystery behind the “Will of the D” – CRUNCHERS ♡
What is the will of D in One Piece? - Quora
The age old question: What does the D. stand for? My Theory: : r/OnePiece
What is the will of D in One Piece? - Quora