You may want to read Evolution of rank names.
I stand by my suggestion:
Actually yeah that's not a bad idea.... Which one: "Legend" or "Legendary"? I prefer the former. It makes "Legendary" look like "Legend-ish" 
I stand by my suggestion:
We're going to need another rank above Legendary eventually (if we don't already). Not sure what it should be called, but others have suggested some titles somewhere.
I'd say just "Legend" sounds good. Or maybe just add a bold font to the current Legendary rank.