If you click a villager who has a name with Shift + right click, you should be able to give him a surname. If two villagers have a child, the child should also be given a surname, the same surname that his parents have, if his parents do not have the same surname but two different ones, they should decide which surname the child has before the child is born can. If you give a villager who has a surname a name tag, he should keep the surname, the name tag is for the first name. Once you have decided on a villager's surname, you cannot change the villager's surname.
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