How to change your Guild name
Guild Leaders (and only Guild Leaders) can change their Guild’s name in-game from the Manage tab of the Guild Admin Menu.
As of updating to version 8.9
Guild Leaders may only change the Guild’s Name once every 4 weeks.
Guild Names will go through the same restrictions as choosing a name for a new Guild. (To make sure the new name is available and isn’t inappropriate). As part of this change, the Guild Admin menu for the Manage tab has been updated.
Support will no longer be accepting Guild name request tickets, after 8.9 releases.