核心问题
be known as, be known for, be known to 的意义和用法有什么不同?
词典解答
be known as 意为“被称作”“被认为”：
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These chocolate bars are known as something else in the US, but I can't remember what. 这种巧克力棒在美国有别的叫法，但我记不起来叫什么啦。
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He is known as a fair judge. 他被认为是一位公正的法官。
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Once they were known as “aborigines”, which means “the first people of a country”, but today they are more usually known as Kooris. 这些迁徙过去的人曾被称作“aborigines”，意思是“最早的居民”，但是现在通常被称为古利人。
be known for 意为“因……而著名”：
He was known for his frankness. 他以坦率而著称。
be known to 意为“为……所知”。注意:known 在这里是形容词,故一般不用 by:
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He is known to the police because of his previous criminal record. 他因以前的犯罪记录而为警察所知。
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I don't think he's known to anybody here. 我认为这里谁也不认识他。