How to choose an English name

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May 24th 2012 20:02 English name
When I was in senior high school,I chose "Jacky" as my English name.Even now I have no idea the meaning of the name,but I know that with the name,my friend can't say "hi" to me on some occasions,like at the airport,since "hi Jacky" sounds like "hijack".
I think there must be some rules to choosing an English name,could you tell me about them?