Boeing HQ did, indeed, move to Chicago in 2001, though it was only senior management and certain other management functions which moved. Boeing still maintains a large presence in the Seattle area, including manufacturing facilities.
The Buffalo Bills were named for the city’s famed collection agencies.
I can’t document this.
The simpler explanation by far is that it’s a reference to Bill Cody.
Obviously Nemo was joking. Buffalo Bills is just a play on the name of the city (in this case using Bill Cody, who had nothing to do with the place). Similarly, their baseball team since the 19th century has been the Buffalo Bisons. Same deal.
Nonsense. We know where the name really came from.
Point taken, didn’t mean to infer that the teams disappeared instead of moved and changed names.
Cowboys and Padres are obvious ones I missed, but the others aren’t quite what I meant. Not just referencing some aspect of a profession but to name the workers themselves (I guess Senators also count). So the Dallas Cowboys count but not the San Antonio Spurs.
Not the cheesemaking industry?
Purdue (University) Boilermakers
Nashville Sounds (Class AAA, PCL baseball).
A nod to the occupation that made this city famous.
Our local minor league team is the Modesto Nuts.
Not sure if it’s for the almond industry or the local tweaker population. 
No love for the Springfield/Albuquerque Isotopes?
They say its for the local nut industry, yes.
If you go to Minor League teams I think you’ll find lots.
The Lowell Spinners (Red Sox A affiliate)
The Norfolk Admirals (AHL)
Wisconsin, as a whole, is known for cheese, yes, but the biggest single industry in the Green Bay area is (as it has been for decades) papermaking.
Even better is the RichlandBombers
They probably don’t get a lot of exchange students from Japan
When I was a kid in Shreveport, I can remember a local team from the short-lived World Football League called the Shreveport Steamers. It’s a good thing they never got sold to Cleveland.
How about the Los Angeles Clippers? Was sailing a clipper ship a common occupation around the team’s original San Diego home?
The Phoenix Coyotes might count - isn’t “coyote” slang for those guys who smuggle Mexicans across the border? That’s an occupation.
Kansas City Chiefs, and the former Kansas City Scouts of the NHL, perhaps? Mind you, there can’t have been too many people occupied as tribal chiefs.
In Rugby Union’s Super 15 (it is 15 now isn’t it, I lose count?) there are New Zealand franchises known as the Crusaders, the Chiefs and the Highlanders.
Not exactly modern professions I know…
Crusaders, Chiefs, Highlanders–those are “mascot” names.