It's the French pronunciation of the word for 'king' (also spelled 'roi'. He's French-Canadian.
Other sports names that have French and English pronunciations:
Yvon Lambert, Montreal Canadiens (pronouced Lam-BEAR).
Several Canadian hockey players named Belanger, pronounced Bel-on-JAY, and longtime Orioles shortstop Mark Belanger (pronounced Bel-AN-jur).
Jacques Martin, NHL coach (pronounced Mar-TAN)
Billy Martin, and other famous Martins in the US, (pronounced MAR-tin).