Take a look at Lingua::EN::Nickname as a start. It's old (last update in 2003), and it's biased toward English names; but it cites its sources. The URLs have changed (no surprise that), but the Genweb project is still alive and there is a link to a nick-names sub-project.

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I Go Back to Sleep, Now.

OGB

In reply to Re: dealing with colloquial forms of people's first names by Old_Gray_Bear
in thread dealing with colloquial forms of people's first names by marekjochec

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