I wonder whether it is considered good or bad behaviour to point out incorrect spelling, but it is Piketty, not Picketty
On one hand it seems like a nitpicky thing to point out, but on the other hand, to paraphrase Lieutenant Commander Data: one is his name; the other is not [1].
Piketty looks weird to me because I pronounce it "Pike-etty" instead of "pique-etty" in my head.