Ermmm I've checked some of the Clans you named and agree they have offensive names.
I also looked for somewhere to report them and found nothing. So I've sent the list to Jagex so they can deal with them.
It's a good find so thank you for that. I'll see about being allowed to report offensive Clan names to Forum Help and see if the F-Mods can send them direct to Jagex. I know Offensive user names can be reported to Forum Help so this should be ok to be reported too. Comprehensive Account Security