Jack is a very common male name. It can also refer to quite a lot of different types of things.
Games named Jack:
- Jack (Jason Lautzenheiser; 2013; Glulx). Ectocomp 2013 entry.
- Jack (Joruiru; Spanish). IV Mini Comp entry.
Real people only known as Jack:
- Jack was a beta-tester for If I Wasn't Shy (Joey Jones; 2012; Z-code).