Cleveland Cavaliers Rookie of the Year winners
2 players won the Rookie of the Year in a season with the Cleveland Cavaliers. They are Kyrie Irving (2011-12) and LeBron James (2003-04). On a roster now: Kyrie Irving and LeBron James.
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.