Not sure if anybody already posted this but the nickname jerseys are on sale in t-shirt form on Netsstore.com. I guess these are the official nicknames they have chosen, although we've already pretty much confirmed or assumed most of them. The coolest one I think is AK's nickname jersey, which is written in Russian.
Evans - Joker
Garnett - The Big Ticket
Johnson - JJ
Kirilenko - Кириленко
Lopez - Brooklyn
Pierce - Truth
Plumlee - Plum
Terry - Jet
Williams - D-Will