If he was physically abusive, I would keep, give it my last name, and hide the pregnancy as much as possible. If asked, I would say I cheated and didn't know who the father was. Even though that sounds pretty bad on my part, whatever it takes to keep that guy out of our lives. I may even consider adoption. But idk if I'd be able to commit to that choice once the baby was born. But to protect the baby, I might. I guess to know my decision I'd have to actually be in that predicament.