Problems With Name

Due to the YouTube terms of using, the name requirements are a must. That's a common problem and however, I find it to be easy solved.
For the start, you can fill whatever name you want, as long as it hits the requirements. After creating the YouTube channel, go to that square at the right top displaying your user photo. Then go to My Channel > YouTube Settings, and there you have an Overview of your Account Information. Slightly below that you have your username and e-mail address displayed. A bit more to the right, you have an option "Edit on Google+", which will lead you to the homepage of your Google+ account. There you can click on your username photo, and change your username, putting whatever you want to be in there.

I hope I helped with this answer, have a nice day!