Well I don't think Boris is anything like an average British Citizen.
He was not solely a UK citizen until recently. He was a dual US/UK citizen until 2016. He obviously tones down his name, officially Alexander Boris de Pfeffel Johnson, to create a more ordinary, man of the people image.
Then there is his very interesting European background which is fascinating if anyone watched his "Who do you think you are?" episode. He has Muslim, Jewish and Christian heritage from the family's background in Turkey, France, Russia, US & UK. But he obviously keeps it toned down for his political career:
- Boris has blood ties to Turkish elites through his paternal grandfather great Ali Kemal - who was a journalist and politician but was asassinated in Turkish political unrest. The family adopted the name Johnson in Britain
- he is a descendent of German, Prussian and French aristocracy and royalty.
So hardly your average UK citizen