My question involves name change laws in the State of: Chicago Illinois

I had my daughter at 15 I'm now 19 her father was there for her the first year or her life. But later decided to leave to Mexico. I have no contact with him or anything. I want to travel out of the country and I can't because my daughter doesn't have a passport. I can't get it without his permission. I dont even know where to find him. I need to change her last name to make everything easier for both of us. He's not in her life anyways. What can I do?