If you put your last name in the company name and don't want to work under a corp I believe in PA you can use it without filing paperwork.  If you do work under a name other then your own you need to apply for it from your state.  This is going off memory, I'm sure it varies state by state.  You should get with a business attorney / accountent to see what you should do.
I always thought it sounded more trustworthy when someone's name was in the title.  Makes you feel like someone's reputation is behind the work.  I guess it depends on what your last name is though.