After your "denial of a bait" I went to see "uncle Google" https://www.mass.gov/service-details/why-is-massachusetts-a-commonwealth. Not really sure, what they wrote about there, but it is clear that "The Commowealt" has noting to do with "Commonwealth of Massachusetts" which sounds more like some sort of a parlament.

Unfortunately, from that state, I only know pubs in Boston, Samuel Adams and pubs in Duxbury. And of course the i95 to Westchester. Constitution bodies was not exactly in the center of my interest at that time :-).