Londoners from London, but no Swindonners from Swindon. Glasgwegians but not Polperregians. Do Cistercians come from Cirencester?
Norwegians, but not Zimbabwegians or Bombegians. Iranians, but Iraqis, Pakistanis but Sudanese. Peruvians ok, but do they call those big fellas Tuvaluvians?