Also known as: Hey! Say! BEST; Hey! Say! 7 Hey! Say! JUMP is a J-pop group under Johnny & Associates, made up of ten members. Hey! Say! JUMP is considered an expansion of the original Hey! Say! 7. 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. (Source: Wikipedia)