If you’re heading to a concert or a football game at MetLife Stadium, you won’t see any road signs that welcome you to Boiling Springs. That was the original name of East Rutherford, the Bergen County borough that serves as home to the sprawling Meadowlands sports complex where New York’s two NFL teams play their home games. East Rutherford is just one of the dozens of New Jersey towns, big and small, that have gone through formal — and, in most cases, substantial — name changes since they were originally established. In some cases, like East Rutherford, the new name was chosen 128 years ago. …