how to aske for someone's name in japanese?

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Answer

Here's an example of a super polite version:
失礼ですが、(お客様の)お名前は何とおっしゃいますか？
"Shitsurei desu ga, (o-kyaku-sama no) o-namae wa nanto osshai masu ka?"

Answer

I don't know, may be exist a "super polite" version of this question, but you may ask this way:
あなたのお名前は何ですか。Anata no onamae wa nan desu ka?
But I think the best way is to say your name to a partner... Politness will demand from your partner introduse himself too.

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you can also say, just like t1n9 mentioned, "namae wa?", which would literally be translated as "what about the name?", given the context it would mainly be directed to a "you", the person you are talking to.

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i only learnt "o-namae wa?" heehee =]

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