Would it be wrong

Hello. I’m not married and I just made 24. Pregnant with first baby and I’m having a hard time deciding if I want to give baby my last name or his. Me and him aren’t together, i don’t plan on being with him. But I have so many people in my ear and I wouldn’t want anyone to be mad at me for not giving baby his last name. I feel like I’m letting everyone else dictate things.! Would I be wrong for giving my baby my last name since I am not a married woman?