You cannot.
According to copyright law protection does not extend to names. You could, however, possibly register the name as a trademark.
Assuming you are in the US the web address to check is http://www.uspto.gov
Even the titles of creative works are copyrighted and protected under copyright laws. If you use any part of a song, the title, lyrics, etc. in naming your band, you can be charged with copyright infringement.
no. Copyright protection does not cover names, titles, common words/phrases, etc etc. In some cases a name can be protected by trademark however.
The name was the dream street boy band or something like that
NO! Try something like well what's your band about?
A copyright is granted to the person that created it. A user name is not considered a proper identification of a person. You will have to use your legal name to register the copyright.
"Join Together" by The Who
Something like a shirt or a CD of a band playing.
No. That's copyright infringment, get that band's permission and it's a yes.
It would be copyright if you do the exact band song name, then again, it isn't their band name but a name of a song used in their band. I would, personally, consider it to be fine since a band's song title is different than the band itself. Then again, it's better to come up with your own, though it can be similar or closely related. For example, I wrote a story about a "Fire Crystal" though I changed the name to "Scorching Gem", to make it pretty much the same meaning, but in a different way.
Names, titles, and common words/phrases are not eligible for copyright protection. They may, however be registered as trademarks.
You need to write something original and then publish it, applying the copyright mark, the date and your name. Copyright protection is automatic.
Choose something that means something to you or maybe an inside joke in your band.