Why does 'will not' become 'won't'?

Shouldn't it be "willn't"?

Homework
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Most contractions in English are pretty straightforward: they are, they're; he would, he'd; is not, isn't; we will, we'll. The two words join together, minus a few sounds. Put it together, and shorten it up. What could be easier?

But that isn't the case for "will not," which becomes "won't" instead of "willn't." Why does the "will" change to "wo"?

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Arika Okrent is editor-at-large at TheWeek.com and a frequent contributor to Mental Floss. She is the author of In the Land of Invented Languages, a history of the attempt to build a better language. She holds a doctorate in linguistics and a first-level certification in Klingon. Follow her on Twitter.