Does my name have to be on the birth certificat? And if I wasn't there how could it get on the birth certificat?

You will have to give a better description of your situation and question. I have no idea what your question actually is. If you take the time to think out what you want to ask and do so in a more understandable way we will be able to help you much better.

Is someone asking you to pay child support on a child you don't believe is yours ?