Hey there. Unfortunately only one name change is allotted at this time:
[quote]Bungie Name Changes
A one-time Bungie Name change is now available for players who wish to update their current Bungie Name. Players can use this change by:
- Logging into Bungie.net.
- Navigating to Profile Settings.
- Under “Identity Settings”, change the “Bungie Name.”
- Click “Save Settings” at the bottom of the page.
[b]Players may only update their Bungie Name one time.[/b] Bungie Names must adhere to our Code of Conduct or will be subject to moderation. [/quote]
https://www.bungie.net/en-us/Explore/Detail/News/51172