Are there any rules governing what we call people from different countries?
For example someone from London might be said to be a Londoner. However someone from America [United States] is referred to as American. Other examples [both on a wide and more local geographical scale]:
New York: New Yorker.
Kent: Kentish [Kentish Men?]
Eton: Etonian [Having been to Eton College]
What I am asking is what grammatical rules govern the suffix that gets attached to the place derived names? They 'sound right' to me but that may be that I have heard them so ofter I am used to them. If I met someone who came from a town, county or country I had never heard of how would I go about deciding that he/she was a ....er, or ....ian, or ...ish?
Londoner sounds OK for use in this way but Londonish and Londinian do not [to me at least]
I hope I have made my query clear. I would be grateful to hear the opinion of others.