How do i pick a first name

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Hi, there, i love English, i love everything of English culture, but my English alway so poor, maybe i need a name of English that is asked for who somebody talking with me before. You know , it is very strange to every English culture to me, how can pick a first name, this problem that troubles me a long time. My last name is Den, who can help me, thanks so much, I hope we are being friend from the other side of the earth.