05-20-2010, 12:05 AM
Basically that would be like using the name "Lisa" or "Sarah" or "Michelle" as a surname in an English or French-speaking country. Here, like in other countries, a given name doesn't just become a family name. The family name "Setsuna" doesn't exist, and it's unusual enough as a given name.
As above though, if you are writing something and don't want it to look 100% accurate, then you can do what you like. Many names in manga and anime are weird anyway.
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