I am writing a prospective that is set in a near future.
The United-Kingdom of Great-Britain and Northern-Ireland is now a republic, which means the British royal family has been abolished by a peaceful revolution. What I mean by a peaceful revolution is that members of the Windsor dynasty were not brutally killed by decapitation, there was just a referendum, and now, the Windsors are hidden among "normal" citizens. Nevertheless, like in the Fifth French Republic, there is still an aristocracy. However, this country still has the word Kingdom in their official long name.
So, I wonder why would a republic have a royalty-related word in their official long name.