I actually lived with a roomate whos name I also did not know for like 2 years. Super embarassing. Was the same situation as with Jacob- she told me her name when I moved in, I forgot it immediately and then never dared to ask again.

But we didn't really communicate anything but a "hello" when we met in the kitchen once in a while and that was about it. I always thought it was really akward to live together with someone you had absolutely no connection with, but we were put together in a shared apartment by the student union.