@Charlie2121
I didn’t mention either parent changing their name when the child was born. I was commenting on the situation where parents are unmarried and/or have different surnames.
So was I.
In the instance of unmarried parents naming their child, in order for the family members to all have the same last name, the baby needs to be given the last name of one of the parents and the other parent would need to change their name to the same one (there's no need to be married to change your name).
My question is why in your opinion the chosen shared name should ideally be that of the father and not the mother?
The decision to name the child comes prior to any potential marriage therefore the choice is to give the child one of 2 names.
So why do you think that name should be that if the father rather than the mother?
In your example it would require 2 name changes prior to marriage, the child and one of the parents. That is a very clunky solution when the reality is it is only the child who needs naming.
Take marriage out of the equation. In the case of unmarried parents who don't want to marry at any point, why do you think that the name given to the child should be that if the father rather than the mother when the father can easily change his name to the mothers? The child is still being allocated one of their names and in order to all share a name, one parent has to change theirs too. Why the mother and not the father?