Guild Nameing

[The Skirata Clan]

It might be the fact that The 501st Legion is a registered name. They are a world wide real life organization. They do charities and stuff. They are the only Official Star Wars group. That might have something to do with your problem. Also check DXD for guilds under that name, They might not let same name guilds.

[Captain Grizzly]

First thing to remember is not to enter too many variations of the name one after another, went through that when trying to get the BTTB name approved. Disney recommends waiting at least 48 hours between submissions. If you enter one after another you'll just keep getting the same rejected message over and over.

According to Disney, once a name is submitted it goes onto a list of names pending approval. Time it takes to be approved depends entirely on the amount of names on the list ahead of yours.

It's best to wait until you get a message when you log in that the name has been rejected before trying a new variation.