Ha! Funny story about that word; when J. R. R. Tolkien was giving names to the towns in the Shire, he wanted to call a small hamlet 'Michel Delving', 'little digging'. He later learned that the word Michel (or Old English Micel) actually meant great and not little, so he made Michel Delving (Great Digging) the largest town in the Shire, and the seat of the hobbits' government, such as it was. Michel passed into modern English as mickle, which is how it came to be used by William Shakespeare.
If a philologist is getting these words mixed up, you know you've found your way to an odd part of the dictionary.