There should be a option for when you have your main clan, The other clans, (ones you start wars with, ect) you can choose the names of them so for mc challenges when you have other clans you have the ones you made yourself!
You can do this via editing your save files without too much trouble. I haven't heard of anything implementing it in game, at least not yet.
if you do want to edit save files, I'd suggest joining the discord for help doing that :)
