Carl Richard Lepsius, an German Egyptologist who was in Egypt 1843-46 on a scientific expedition, and documented well it with hundreds of line drawings of incriptions, papyrii, maps etc. in Denkmaeler aus Aegypten und Aethiopien, an outstanding work, still relevant to this day as there are many incriptions that has been lost since then. Tutankhamun's name can be found in a couple places, like this: III, 115 So yeah, his name was known some 170 years ago, but probably not much else.