"Legion name is invalid. Please try another."? Siel server, Asmodian

So, I'm trying to create a legion. "The Dreaming", but it is saying it is an invalid name. Can you help me as to why?

I've tried to write it in various ways, so I'm sure the name isn't taken. Is it just because it has a space? I created a legion called Wut moments later, but the legion name is important to me and seems to disallow me using it in any way. I can't imagine its got something to do with the space; because I've made legions with spaces in the name before. . .

Thank you very much for your time.

 

Already taken. Or a profanity filter fail. I wanted to make a legion ''F*CK BR'' but nothing with BR was possible.

 

Well, I made it without the space. . . I think something just glitched and it wouldn't let me use spaces. I wish I could fix it, though. X( 'Cause I tried writing it "o The Dreaming o" or "x The Dreaming x" and even "T h e D r e a m i n g"--and I have a legion named the same thing with my Elyos on the other server, which is why it was so important to me. But I couldn't get it to accept anything with a space in it. So now, it's "TheDreaming", which makes me slightly disheartened because I know it can go the other way, it's just doing something weird.

Ah, well. Thank you so much for your prompt response. ^^