Does the child have to have the fathers last name to get child support?

I live in Missouri. My children have my last name (their father and I were never married) and I have a child support order in affect. Try contacting your local Child Support Enforcement agency for more information. That is how I went about getting an order. GOOD LUCK! It is a LOT of paper work, and a big headache, and everyone may have to do a DNA test, but if he helps pay for your kids to live, then it is all worth it... Just remember - wether they have his last name or not, he helped make them, and he should help pay for them... You do not get a break, so neither should he.