Display names now?

If the channel is linked to a personal Google+ profile you'll probably need to have Firstname Lastname. If it's linked to a page as new channels tend to be these days, it can be a single name like you want. Might depend on how you have it linked. Since my channel is one of the "new" types that is connected to G+ by default it is linked to a page instead of a personal profile and I have the single box.
 
If the channel is linked to a personal Google+ profile you'll probably need to have Firstname Lastname. If it's linked to a page as new channels tend to be these days, it can be a single name like you want. Might depend on how you have it linked. Since my channel is one of the "new" types that is connected to G+ by default it is linked to a page instead of a personal profile and I have the single box.
So if I linked it wrong is there a way for me to fix it?
 
You used to be able to unlink an account from G+, but I'm not sure you still can at this point and I think you were only able to switch it to the Google+ profile attached to your account.

I think the only real options would be to either A) beg and kiss Google's a** somehow, or B) new channel if you want the proper name-changing feature.
 
And if create a new YouTube it you can't use that url. Even if you delete the channel you can't use that url again.
 
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