Lots of lingo for "Jack"

Dy-No-Mite - JJ from "Good Times"
Fishhook
Hector - the Jack of diamonds
Hogier - the Jack of spades
Hook
Jackal
J-Boy
John
Knave
La Hire - Jack of hearts
Lancelot - Jack of clubs
Trout Line - four jacks (four fishhooks)
Valet