gThe same family name or two different name?h

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@Most people hope to have the same family name. But some people would like to be two different names. How you feel this topic? In my case, I would like to have the same family name.

Including me, why most people support the former opinion? Of course, everyone has his own concept of happiness. But I think that the same family name is happy. Because a family name is a symbol of family unity. And, I think that the custom of sharing the same family name should continue in Japan.