Quote Quoting Jaclyn Bird
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how I could change her last name to my fiances name with out affecting the child support.
Doesn't work that way. If you want your boyfriend to become her father, then he needs to adopt her. If you want to keep receiving the money from your daughter's father, then you leave things the way it is. So now you have to decide whether it's more important to have a cohesive family like you want, or to pad your wallet.

Any name change will have to have dad's approval and what you're doing is commonly known as a backdoor adoption - court's don't allow that.