My question involves name change laws in the State of: Missouri

I was wondering how you can change the name of a minor when she has my maiden name and the father is not on the birth cirtificate and there isnt any records at all of who the father is. The father as never been around and has only seen her when she was 6 weeks old and now she is 6 years old. He has made no contact at all and now is getting in trouble with the law. I have been with my now husband since she was 1 years old and I now have a different last name and other children and want her to have the same last name as the rest. Again she has my maiden name. Do I have to even contact the father at all since there are no documents at all on who he is and she doesnt have his last name please help me thank you for your time and help