Hey,
Destiny uses its own naming scheme that is separate to your platform name, this is due to cross play being enabled and as of writing this name change will be available later this winter.
[quote]After last week’s announcement about Cross Play and Bungie Names, we wanted to clarify a few things:
The display name of the first platform that players log in with to play Destiny 2 beginning at 10 AM PDT on August 24, 2021, will become the player’s Bungie Name.
Platform ID numbers, non-standard characters, and symbols will be removed and excluded.
If a name violates our Code of Conduct, it will be changed to “Guardian.”
Name changes won’t be available until a later update.
For Steam players: your Steam profile name, not your Steam account name, will become your Bungie Name.[/quote]
Quote taken from this [url=https://www.bungie.net/en/Explore/Detail/News/50519]TWAB[/url].