why people in japan like use word like tree mountain in their name

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日本以前是没有姓氏的，明治维新之后他们的政府才规定居民要有姓氏，所以很多奇奇怪怪的姓氏就出现了，这么短的时间怎么创造出来那么多的姓氏呢，所以见到什么就把那些动当成姓氏，或是以方位为形式，所以现在的姓氏有什么"龟田，松下，田中“等等奇怪的东西...:P

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I would guess it's because of their culture. Isn't it a similar situation in China?

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Jesse 說的有她的理由存在。
可真假要得去問問日本人。 
聽聽他們的說解為參考也不錯！

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why do people in Japan like to use words like' tree' or  'mountain' in their name?