Joy Boy’s true identity was revealed long ago by Eiichiro Oda according to one theory.

SUMMARY

Following each chapter, the secret of Joy Boy is gradually exposed to the entire One Piece world.

However, there is a theory circulating on the internet that provides further information about Joy Boy by linking the facts presented in One Piece.
According to the theory, Joy Boy is not a name but a moniker given to another pirate whose true identity may have been disclosed many years ago by Eiichiro Oda.

The mystery of Joy Boy is slowly being revealed to the entire One Piece world after every chapter. Since the start of the Egghead Island arc, Joy Boy has become an important topic of discussion, and Dr. Vegapunk has given a lot of details about the first known pirate in history, which played a crucial role in the war between the Ancient Kingdom and the World Government.
Strawhats in One PieceOne Piece | Toei Animation
But his identity still remains unknown, and even after so many revelations, there are still a lot of things left to be uncovered about the mysterious One Piece figure. However, there is a theory making the rounds on the internet that gives more details about Joy Boy by connecting the information shared in One Piece.

According to the theory, Joy Boy is not a name but a title given to another pirate whose true identity may have been revealed long ago by Eiichiro Oda, the creator of One Piece. The pirate who was called Joy Boy was none other than Davy Jones, who inspired the Davy Back fights, first seen during the Long Ring Long Land arc.

The Importance of Davy Jones in One Piece

According to folklore, Davy Jones was one of the most notorious pirates in the world. He was so greedy that the devil himself cursed him to spend eternity beneath the sea and collect all the lost treasure that would be of no use to him. He stored all his treasure in a locker, and that locker is called Davy Jones’ locker.

In the One Piece universe, Davy Jones has only been mentioned once during the Long Ring Long Land arc, when the Straw Hat Pirates got into a Davy Back Fight against the Foxy Pirates and almost lost Chopper. Before the start of the fight, Robin explains who Davy Jones is and why the fight is named after him in One Piece.
Robin Talks About Davy Jones | Viz MediaRobin Talks About Davy Jones | Viz Media
Davy Jones is one of the biggest legends of the pirate world, and there have been speculations that he and his traditional pirate game will once again become a part of the narrative in the One Piece final saga.

One Piece Theory Claims Joy Boy is Davy Jones

According to a theory posted by u/RoronoaLuffyZoro on Reddit, Joy Boy is not a name but a title given to Davy Jones, and there are some pretty valid reasons for this speculation. The first of them is the Laugh Tale island. According to the theory, Laugh Tale Island is hidden in the hollow earth, which is why it requires four road poneglyphs to reach down there.
Gol D. Roger's Last Message | Toei AnimationGol D. Roger’s Last Message | Toei Animation
Also, according to one of the translations of Gol D. Roger’s final message to the One Piece world, his treasure is hidden somewhere “down” there. Therefore, there is a chance that the real One Piece treasure, which actually belonged to Joy Boy, is actually at the bottom of the sea. And the only known treasure beneath the sea is Davy Jones’ Locker.

Therefore, if the story holds any ground, it can be said that Eiichiro Oda already foreshadowed the real Joy Boy, and he is none other than the famous Davy Jones. While the theory doesn’t have much credence, it certainly connects a lot of aspects of One Piece together.