In addition to what mute had said, a clan name ban means that your clan was reported for breaking Bungie's [url=https://www.bungie.net/7/en/Legal/CodeOfConduct]Code of Conduct[/url] and action was taken which removed the name from your clan.
Also, here is the Bungie Group of Forum Ninjas: https://www.bungie.net/en/Groups/GroupMembers?groupId=121