Last name

This is not the first time this has happened.
Babies should always have the last name of the blood father.
I don't know I just can't get behind this train of thought be it right or be it wrong a sperm donor is not a father and if the couple is not married then it is not a legal transfer of name so I believe it should be up to the mother if the father proves over a period of a Time that he is truly a father and not just a sperm donor then I believe any child would want to carry his last name. And in my case where I didn't meet my father till I was 27 after I kicked his *** his name died. There is no more important job or bigger responsibility than to raise your children support them protect them and love them, be there for them if you can't do that go jump off a bridge that's fine some kids probably crying at night wondering why nobody's explaining the rough world to him/her. And teaching a son how to be a man. It's not a title it's a job for a lifetime.