Related Information for Hey! Say! JumpHey! Say! JUMP is a nine-member Japanese boy band under the Japanese talent agency Johnny and Associates, Inc. The name Hey! Say! refers to the fact that all the members were born in the Heisei period and JUMP is an acronym for Johnny’s Ultra Music Power. Like agency seniors å…‰GENJI and V6, the group is split into two subgroups: Hey! Say! BEST (Boys Excellent Select Team) and Hey! Say! 7 (not to be confused with the temporary group of the same name), which consists of the five oldest memb. read more