Either that, or it could be that the Mc you know is a descendent of someone who is mighty cockish. You see, even though it's simply a prefix added to the name. the name does stick to offspring. Because of this, there's a chance that a McSomething could be mighty uncockish if his/her father was mighty cockish...that's the only explanation I can think of.
Another good example is Ronald McDonald. What a cock.
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