Likely you have heard at least some of them. The Waterfall, Tristesse, Torrent, Revolutionary, Winter Wind, and Ocean etudes are some of the most popular and recognizable.
Chopin didn't give nicknames to his compositions, and serious musicians are, by and large, loath to use them.
I wonder how many people learned 10/2 as one of their first etudes (as I did), blissfully unaware that it’s “supposed” to be one of the very hardest.
I have increasingly little faith in the value of such rankings, even when the items are broadly placed into groups rather than in a linear order.
I have to wonder with Stevebob what exactly the value of ranking "difficulty" is.