"Don Chadwick is the designer behind both the Aeron and the Chadwick. The Chadwick is the one he put his name on."
The Aeron was a collaboration between Bill Stumpf and Chadwick. They'd worked together on chairs before for Herman Miller (Equa chair, 1984 & Sarah chair, 1988). I'm not sure Bill would have appreciated naming any of these chairs "the Chadwick."