 The first two kinds of knowledge concern acquaintance or familiarity—what we might call “knowing-of.” Knowledge of names probably refers to knowing words, without necessarily knowing how to correctly distinguish what shí (stuff, objects) they refer to. An example would probably be the  blind man  who can use the words ‘black’ and ‘white’ in statements such as “Bright things are white and dark things are black” but cannot identify black or white objects when presented with them. Presumably the criterion for knowing a name is knowing how to use it in at least some contexts.