Father's Last name or not??

May di naging maganda nangyari samin ng tatay ng pinagbubuntis ko. Nangyari ito bago ko malaman na may laman na tiyan ko. To the point na kinasuhan ko po sya. Nagmahalan po kami walang kwestyun dun but my point now is...do i have give him the right na ipangalan sknya anak namin though hindi na kami makapagbalikan? He's very sorry to what he did but it's too late and he wants us to get back together for the child. Gusto ko lang po makarinig sa inyo ng opinion 😌...