Unable to Create a Guild

Hi, for some reason no matter what name me or my friends put in for a guild charter, we are unable to start one as it says every name we try is "Reserved" and that we have to pick another. We've tried five different names that are all very niche and we still cannot secure a charter. Is this a server issue, do I have to contact moderators? I'm not totally sure what's happening here. Please help!

Have you tried typing in those names into the armory to check if guilds with those names already exist? I mean this server has been up for a decade a lot of guild names are taken.