I think that most players don't want to meta. Try hard not to. But we are human and sometimes we do a thing without even realizing it. So I am a big fan of mechanics that make it easy for us to play how we most want to. Mechanics that help reduce meta and smallworlding.
With that in mind, I would LOVE it if all NPC names (including mementos) were changed to follow PC rules and norms.
No more multi-word names. All NPCs have a single word name. If they have a title like Judge or Agent, make that a title as a PC would, not a part of their name. If they have a first and last name, use one and, on some occasions, add the second as a title.
If you look into adjacent rooms and see only multi-word names, it's easy to think, "No visible PCs there." I think most of use then think, "Need to act like those ones are though. Kind of." By changing naming standards, we don't have to do that anymore as we won't know if that memento or unfamiliar name is a PC or NPC. We can't know just by the name anymore.
