Was sin necessary for knowledge?

[John V]

First, the idea is that Adam could name the animals even though he didn't have knowledge of them. The idea is that in the pre-Fall state, Adam could perceive directly the essence of each creature. Today the names we have for animals are only contingent, so "cat" in English and 猫 in Japanese are just labels chosen more or less at random. But the name Adam gave to that creature is intrinsically connected with the essence of the animal -- to its cat-ness. 

This reminded me of:

Rev 2
17 He who has an ear, let him hear what the Spirit says to the churches. To him who overcomes I will give some of the hidden manna to eat. And I will give him a white stone, and on the stone a new name written which no one knows except him who receives it.

Maybe each person has a unique name connected with their essence.