1. car jack

jack (jak), n. 1. any of the various portable devices for raising or lifting heavy objects short heights, using various mechanical, pneumatic or hydraulic methods: an automobile jack. 2. Also called knave. a playing card bearing the picture of a soldier or servant. 3. a connecting device in an electrical circuit designed for the insertion of a plug: a telephone jack. 4. (cap.) Informal. fellow; buddy; man (usu. used in addressing a stranger). 5.a. one of a set of small, six-pointed metal objects or pebbles used in the game of jacks. b. jacks, (used with a sing. v.) a children's game in which objects are tossed and gathered, usu. while bouncing a rubber ball. 6. any of several carangid fishes, esp. of the genus Caranx. 7. Slang. money. 8. a small flag flown at the bow of a vessel, usu. symbolizing its nationality. 9. (cap.) a sailor. 10. LUMBERJACK. 11. JACKASS (def. 1.) 12. JACKLIGHT. 13. a device for turning a spit. 14. a small, usu. while bowl or ball used as a mark for lawn bowlers to aim at. 15. a young male salmon before its migration. 16. Falconry. the male of a kestrel, hobby, or esp. of a merlin. 17. Slang. nothing: You don't know jack. JACK SQUAT. JACK SHIT. 18. Slang. a physically attractive and desirable male. -v.t. 19. to lift or move (something) with or as if with a jack (usu. fol. by up): to jack up a car. 20. to increase, raise or accelerate (prices, wages, speed, etc.) (usu. fol. by up). 21. to boost the morale of; encourage (usu. fol. by up). 22. to hunt or fish with a jacklight. 23. Slang. to steal, or to have something stolen. 24. Slang. to mess up something or someone: You got jacked. -v.i. 25. to hunt or fish with a jacklight. 26. jack off, Slang (vulgar). to masturbate. -adj. 27. Carpentry. having a height or length less than that of most of the others in a structure: jack rafter; jack truss. [1350-1400; ME Jakke used in addressing any male, esp. a social inferior, var. of Jakken, var. of Jankin, = Jan John + -kin -KIN]

2. jack (knave)

3. telephone jack

4. jack (common man)

5. jacks

6. Jack, genus Caranx

7. jack (money)

8. union jack

9. jack (sailor)

15. jack (male salmon)

The name Jack is a derivative of John and is still one of, if not the, most popular names for men in English-speaking countries around the world. Its meaning is "God is gracious" and has Hebrew origins, but is most commonly used in Great Britain, North America or Australia, or France, with its French equivalent, Jacques.

Aside from my father's father, Jack Crawford, several famous men have been named Jack... here are a few of them...