Hi BOOMSHAKALAKA,
Unfortunately this isn't possible. You'll have to either make a new account or live with your new name.
Sorry!
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Do I have any disadvantages with a new bungie account except that the friends are gone?
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Your new name only shows in game and on Bungies site. You add people on your frie ds list on Bungie or your system of choice.
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Cross Save cannot be unlinked for 81 days because you recently purchased Silver on your Steam account no chance