- Metal Gear is full of them!
- Little John (Raiden's kid)
- John Doe (Joked around in MGS3 and one of the AIs for the Patriots' system)
- Ivan Raidenovitch Raikov (Ivan is also a John/Jack when translated from Slavic to English language) Thanks weedle
- General Ivan (Vulcan Raven to talking about Ocelot during the Shadows Moses Incident )
- Coincedently you can count Jack (Raiden) since Jack is 'short' for John.