Hello there!
Sorry, but it's currently a [b][u]one time change.[/b][/u] There are currently no plans on allowing further name changes, even if there was an error. For more information, please see the [url=https://www.bungie.net/en/Forums/Post/260729643?sort=0&page=0]name change FAQ.[/url]
The below information may also be helpful.
[quote]Bungie Name Changes
A one-time Bungie Name change is now available for players who wish to update their current Bungie Name
Players may only update their Bungie Name one time. Bungie Names must adhere to our Code of Conduct or will be subject to moderation.
https://www.bungie.net/en-us/Explore/Detail/News/51172
[/quote]