Auru'in & Perth's Highborn Union Society?
Just call it Auru'in & Perth's. If it's successful it won't need any name longer than that - people will automatically know what it means.
Just like how the official record of the British House of Commons debates is called Hansard. It had a longer name once but now it's just only referred to by the name of the person who founded it - and everyone knows exactly what it means.