In the UK we have scottish team Hamilton Academical which was founded by scholars.
In England Northampton Town FC is nicked-named “The Cobblers” after the shoe-making industry. And my current local team is nicknamed “The Brakes” as it used to be owned by an automotive parts company.
Orlando Magic for the “Magic of Disney” might qualify.
Is this pro only? I love the East Liverpool (Ohio) High School Potters – named for the town’s history of making pottery and ceramics, especially the Hall China Company, still in business after 108 years. Those people need that factory.
http://www.pottersportsonline.com/
There once was a Potters semipro basketball team, too.
Was he a famous bill-collector?
Yes; he was known for buffaloing people into paying.
Buffalo Bills bill Buffalo Bills’ Buffalo Bill buffaloes?
I’d never head of that and don’t understand the connection. What do Royals have to do with a livestock/rodeo show?
I’d always thought that the KC Royals name was a nod to the old Negro league team, the KC Monarchs, but I’ve no documentation of that.
The Orlando Magic are named in honor of the city’s largest employer.
ETA: oops, sorry.
I think it would be kinda funny to have an NFL team called the Clippers. 
Were the Minnesota Vikings named in honor of the many Nordic immigrants who settled in that area?
Yes, together with the Kensington Runestone.
Royals was a good name for the KC team in 1969, as it could simultaneously reference the American Royal livestock show, the Negro leagues Kansas City Monarchs, and the Western Association/American Association Kansas City Blues or Blue Stockings.
Before Kansas City played under any of those names, however, their first teams were known as the Cowboys, which counts as an occupational nickname in this case with KC being a cattle drive destination.
Essendon Bombers, not for bangy bombs but for a long kick called a bomb.
Freemantle Dockers, well Freemantle has a dock.
Nitpick: The team was the Steamer (singular). Not that it makes the Cleveland joke any less appropriate.
High school nicknames that come to mind:
Collinwood (Cleveland, OH) Railroaders
Noblesville (IN) Millers
Lorain (OH) Steelmen
Cairo (GA) Syrupmakers – as in Karo Syrup
Astoria (OR) Fighting Fishermen
Jordan (Sandy, UT) Beetdiggers
Hampton (VA) Crabbers
Hoopeston (IL) Cornjerkers
Sadly, the Steelmen are no more. Lorain High School closed several years ago, and then was reborn as the new Lorain High School this past year. The new school’s new nickname is the Titans.
nevermind
Calgary Cowboys (WHA)
Calgary Roughnecks (NLL)
Quebec Nordiques (NHL, WHA not an occupation but a location)
Calgary Wranglers (WHL, moved to Lethbridge and renamed Hurricanes, hey it’s windy down there)
Calgary Hitmen (just kidding, but the WHL team originally owned by Brett (The Hitman) Hart, among others)
There’s plenty of other English nicknames which come from former local industries:
Sheffield Utd. = Blades (steelmaking)
Luton Town & Stockport County = Hatters
Southend = Shrimpers
The one official name to have such origins is Arsenal, originating as a workers’ team in the Royal Arsenal.
Liverpool F.C. - “Thieves”
The Houston Rockets actually kept their name when they were transferred from San Diego in the early '80s.
The name still fits because of the NASA connection though.