Answer According to the Celtics' official website, here are all of the players who have ever donned the number 31 jersey in the Green and White:
Tom Boswell 1975-78
Cedric Maxwell 1977-85 (also wore #30)
Fred Roberts 1986-88
Ron Grandison 1988-89
Xavier McDaniel 1992-94
Derek Strong 1994-95
Joe Johnson 2001-02
Mikki Moore 2002-03
