Yeah the Norwegian thing is called russ; I'm not sure where the name comes from ultimately. The rum- in rumspringa (running around) is probably related to the space sense; it can mean both "a space" and "Space" like our word.
The hall question is a good one! My guess is "hall" once meant the entire inside space which gradually became partitioned off into our various rooms until all that was left was the corridor between them, but that might just be too simple.
Maybe simple is good? You could be right? In olden days etc have big 'hall'; folks just eat, drink, etc n pass out but a select few, over time, start walling of stock animals, then themselves, based on class, use, wealth, etc. Sheets, like Arabs, or then walls, in colder areas? Then progessively as wealth increases or social mores or threats change gets more and more roomed off?