I checked in the OED and came up with nothing. But Cecil Adams has a lot more to say about it. Check it out at:
http://www.straightdope.com/mailbag/mdick.html
Doug
edit:
Quote:
Most nicknames are just shortened versions of the full names, for example:
Jon is short for Jonathan.
Mike is short for Michael.
Matt is short for Matthew.
Meg is short for Megan.
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However, Bob is short for Robert