Name regret

Im stuck in a dilemma and would love for some opinions and/or help. I have picked out two baby names that i come down to the first is Josiah Timothy Myers having my last name. Or Grayson Samual Bielawa having the fathers last name. First i wanna state that i care what people think and it kills me when someone says something negative about the names i pick and it kinda makes me want to change it me feeling bad that people dont like it or my child will be made fun of. Now I'd like to say ive been getting many opinions on the names i have picked. People saying how josiah is a black person name, or how the name sounds like two first names or timothy is a terrible middle name. First i think its kinda rude for someone to think that, but a lot of people are telling me this and its kinda getting to me considering me wanting to change it. My next question is my dad wants me to name the baby after my last name because im not married to the father, and he thinks something dirty or bad could happen if i left the father (my current boyfriend) . Can i give my child the fathers last name, but jold on legal rights till we get married in case this situation happens. scenario reasoning is im going to college in arizona and he says the father could stop this if my baby has his last name, I live in Pennsylvania now. Id like to have the baby's name Grayson Samual Bielawa, but feel like my parents wont support it or will be pissed. Also i dont know if it helps to state im 17 so i dont want to make them mad if i decide to give the baby the fathers last name