The Valyrian Freehold

Welcome to the Valyrian Freehold, the greatest empire the world has ever known. Mighty dragonlords rule over vast territories, wielding powerful sorcery and commanding the mightiest creatures ever to grace the skies: dragons. The Freehold of Valyria stands at the pinnacle of its power, its influence spreading across continents, its capital a city of wonder and danger. For the sake of all the gods in Valyria, if you have any suggestions please tell me about them. (Particularly about Valyrian houses; there's supposed to be fourty of them, but like hell am I gonna come up with reasonable names or lore for them.)