And their perennial rivals from Oxford are Oxonians. The English class and education systems being what they are, many in both categories will have been students at Winchester College (a "public school", which is to say an old, prestigious, expensive private school), which makes them Wykehamists. If not, perhaps they went to another public school, Shrewsbury School; its students, and people from the county of Shropshire, are of course Salopians.
England is particularly good (if that's the right word) at these but it's not alone. If you're from Buenos Aires then you're a Porteño (because it's a _port_). If you're from Christchurch then you're a Cantabrian (because of a historical association with Canterbury in the UK). If you come from Rio de Janeiro then you're a Carioca (from the name of a tribe that lived there before the Portuguese invaded).
England is particularly good (if that's the right word) at these but it's not alone. If you're from Buenos Aires then you're a Porteño (because it's a _port_). If you're from Christchurch then you're a Cantabrian (because of a historical association with Canterbury in the UK). If you come from Rio de Janeiro then you're a Carioca (from the name of a tribe that lived there before the Portuguese invaded).