Why is Milwaukee's basketball team called the Bucks?
A buck is a male deer. According to my father, the team held a contest after Milwaukee was awarded the team to pick a suitable name. I believe buck was suggested by a number of people. Wisconsin is a big deer hunting state. But why a buck? They are powerful and agile, which in basketball are two useful skills.
No the Celtics are a professional basketball team in the National Basketball Association. Boston's MLB team is called the "Red Sox" At one time Boston had another team, called the Braves (or the B's in a couple of seasons). That team relocated to Milwaukee and then to Atlanta where they are still called the Braves.