How Common is Common Sense?

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Common is an odd word. We use it mostly to denote something which occurs frequently or something which is lowly, undignified or unremarkable. "Puddles are common when it has rained." "Only common people neglect to cover their mouths when they cough!" "He's common as muck!" was sometimes heard in the North of England as a pejorative meaning that the person behaved and spoke like one of the 'lower class' or common people. (A common rejoinder might have been "Ay, but where there's muck there's brass", meaning that there are often riches to be made from dirt!) My mother used to tell me (she was a terrible snob) to speak properly and not like the common 'village boys'! I think that she thought that we didn't have much in common. "Commons" is an old word meaning ordinary or day-to-day food as eaten in a family (but really refers to any daily meal taken with other people). So what about 'common land', the common speech, a common language? Is it all just 'Common Sense' or should we think more about the words we commonly use?