S|O Issues

✨Ebonyy`✨ • First Time Mother , Twenty-Five Years Old ; Engaged To A Wonderful Man Name Chris !
I'm having some issues w/ my s|o ; I'm 30+ wks soon to be 31 wks on Monday , I still don't know the gender of my baby . If I have a boy w/ this being my FIRST pregnancy I want to name him Princeton Amir (mommy little prince) , my s|o wants to name the baby Christian . Now don't get me wrong I don't have a problem w/ the name Christian ; I feel as though my s|o wants something that's close to his name (Chris) . he has TWO sons already his first born is name after him (jr.) his second son is name jaylen ; we can't agree on any boys names b|c it's not "Christian" he said he was going to be the one to fill out the baby birth certificate put Christian as the baby's name when the baby's born ; my question is can he do that ??? Is the mother the only one who can write the baby's name on the certificate ???? Share your answers please !