The name "Jack" was already used to describe another fabled London attacker: "Spring-heeled Jack", who supposedly leapt over walls to strike at his victims and escape as quickly as he came.
O nome "Jack" xa fora empregado anteriormente para describir a outro criminal famoso en Londres, "Spring-heeled Jack", quen saltaba por riba dos muros para atacar as súas vítimas e escapar rapidamente.