Why does the man marry by adoption and the child takes the father's surname?

Usually this situation is because the son-in-law's son-in-law adopts, eats other people's meals and drinks other people's meals. So I don't think I can say my last name after having children, because eating other people's mouths is short.

However, if you think from the bottom of your heart, I believe that every man does not want his child's surname to be the woman's surname, because after all, it is normal for children to carry on the family line since ancient times, and it is normal for outsiders to see it. It won't make any difference, but if there is a letter from his wife, some people may think that the south is incompetent, and even say that some old people simply can't accept their grandchildren. The woman's surname is old and unacceptable. As a son, of course he can't accept it. If there are many children, it is acceptable for a boyfriend to take the other person's surname, but now there is generally only one child. If the child believes the woman's surname, who will inherit his own needs? So I still find it unacceptable.

I believe the same is true in real life. If we can change the child's surname to the woman's personality, it must be because we owe her attitude, or we have to rely on others. This is not out of our own will, but it cannot be said that only in this case will children and women appear. I believe that every man won't want his only child if he can stir up the beam of the family and don't owe it to the woman.