Another cool person named jack?

Question

for strange reasons i need to know four people named jack, no they do not have to be real. i have three of them already and i need one more. i have jack skellington, jack sparrow, and jack the ripper. i dont want answers like jack frost lol or jack and jill.

Answer 1

jack dawson......leonardo dicaprio's charactor in titanic

Answer 2

jack from tim burton's batman

jack nicolson played the joker and the joker's name was jack.

Answer 3

jackie chan! :D