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Good evening. A change in a child's surname would have no impact on the child support obligation of either parent. I can't say whether the court will grant your petition, but I wouldn't be optimistic. You aren't even married to your fiancé right now, and he has no legal relationship to your son, so that alone makes it an uphill battle. If the biological father opposes the petition, that would usually make the change under those circumstances particularly unlikely. But you're welcome to try and the last name is ***** ***** legal parentage for child support purposes.