Being an Aussie, I am of course a huge cricket fan. I can't help it - it's bred into me :p
I'd never wondered before where the name of the game originated. And after having a (fairly quick) scout around it seems that nobody really knows for sure.

This reference seems to suggest that the word might be combination of the words "crook" and "wicket", as early versions of the game played by shepherds involved the use of both.

Although CricInfo has a fairly extensive section on the history of the game, it doesn't really give any clue as to where the name may have originated from.

Wikipedia also presents a few theories, but nothing conclusive.

Anyway, an interesting little diversion for a Monday morning.

Cheers,
Darren :)