What about something completely new? I say we start fresh with the names, and go for something like Dragongild or Frozenhalls or whatever.
I second this motion. Also, I suggest having at least three parts to the fort's name, and using at least one or two of the other parts that never get used in succession games. Deathhalls the Murder of Merchants or something like that would be a great name for a succession fort, as opposed to the usual short compound names.
Everyone wants it to be a prequel... I like to move forward! After another apocalypse; a fresh start in the distant future that somehow sucks even more for those that have to live in it. Incompetent gods and such...
I think that an actual prequel might not be such a good idea, we couldn't call on the likes of Stuzang, Led Shakeoars/Shakecannons or the Foul One, and having overseers or lore-writers introduce them at their own discretion would turn the metaplot into even more of a mess.
I also don't know if another future fort is such a good idea either; metaplot-wise, the fall of Hellcannon would mean the Foul One finally gets to succeed in unmaking the universe, IIRC. However, given the incredibly stiff resistance the universe put up against it, and the prevalence of body-surfers and other metaphysical entities, I think we could justify the new Aluonra as a parallel universe, very close (but still different) from the one the Foul One unmade, which has attracted many entities fleeing the old Aluonra. Mego and Gizogin could have escaped through the cracks in reality, Queen Led would be able to use her power to force a passage, Andreus (if he returns) is already casually crossing over between universes as it is I believe, and I'm sure TAD would figure something out.
This way, we'd be able to refer to past events and characters without issue, and the differences in e.g. biome layout and historical figures would be explained easily. If Led isn't ruling our civ in the new world, then it's because she never existed here; however, she's forced a way into this world, and now unleashes her horrifying minions on it. Those dwarves and overseers who have made their mark on the other universe may not exist as historical figures, but the souls streaming in from the old universe would bring knowledge of them and their actions. Overseers who've already taken a turn in a previous fort could be reincarnated refugees, or alternate-universe versions of themselves. It's still a reset of sorts, but it's the kind of reset where we don't have to "forget" what came before.
For the site, I STRONGLY suggest either researching the regions to find one where the dead don't reanimate (which would suck) or embark on the border of an awesome reanimating evil region and a much-less-evil one, so we have somewhere to stuff the corpses. There is no way the fort would survive to see the third year if nobody knows how to dispose of the corpses safely, so we pretty much need a safe region to toss them in, even if it's only 1/4 the map.
We could always just have a sacrificial dwarf dig a pit to dump corpses into. The squirming pile of biomass that would accrue at the bottom might still scare the willies out of any dwarf who goes near it, but they wouldn't be wandering around through the fortress, causing everything to grind to a standstill.