Golden State Warriors Rookie of the Year winners
3 players won the Rookie of the Year in a season with the Golden State Warriors. They are Chris Webber (1993-94), Mitch Richmond (1988-89), and Jamaal Wilkes (1974-75).
A winner counts for a club when he played for it in the season he won, the Immaculate Grid's rule. Award lists from Wikipedia. Seasons are on file in full from 1993-94; before that only some of the stars are, so an older name can be missing.