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Here is a different theory:

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English (almost exclusively U.S.): nickname occasionally used as a given name in its own right. It derives from the English term of endearment, itself probably from Middle English chukken to cluck (of imitative origin). It is now often used as a pet form of Charles. Pet form: Chuckie.
http://www.ancestry.com/facts/Muntz-places-origin.ashx?fn=Chuck&Submit=Check+meaning