Hi there!
All players are provided one name change at this time. Once that name change is used, you will not be able to change your name again until Bungie provides a path to change your name again.
For more information, please review the below article.
https://help.bungie.net/hc/en-us/articles/7648312251284-Bungie-Name-Guide
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I’m hoping a bungie rep will see this and help me