I don’t mean to be pedantic… but if you’ve ever run any published module or adventure, then this would be true.
Indeed. My players have met that recurring character... how was it called, yes, kobold #3, repeatedly. Too bad the interaction never lasted more than 12 or 18 seconds to explore his rich backstory.
To answer more seriously, I'd say yes again in a way that's inevitable at higher tier. If you're playing in an established setting, the royalties are very likely to be named. If you're a "saviour of the realm", there is a good chance one will reference them, and honestly if after saving Breland three times, the PCs aren't awarded the order of the golden bear, with cross and palms, they'll really start remembering that there are five nations, after all...