Findings:

• Jack Acid (user)
• Jack Kerouac
• Jack of All Trades
• Little Jack Horner
• Jack Nicholson
• data jack
• Jack Salem
• Cactus Jack
• Jack L. Chalker
• Jack
• You Don't Know Jack
• Jack in the Box
• Jack Webb
• Jack Ketch
• Jack Kirby
• Jack the Ripper
• Jack Sams
• cider jack
• pepper jack
• Jack and Coke
• Apple Jacks
• Jack Teagarden
• Jack London
• Jack McKinney
• Jack Vance
• Jack Bruce
• Jack Kevorkian
• Jack Sheldon
• Wolfman Jack
• Yukon Jack
• Jack Tramiel
• Jack Ryan
• Sourdough Jack
• Black Jack
• Springheeled Jack
• Jack Benny
• The Jack Benny Program
• Jack Klugman
• Jack Dempsey
• Jack Frost
• Jack Skellington
• Jack Lemmon
• Jack the Bear
• Jack Casady
• Jack Maggs
• Jack DeJohnette
• Jack Ruby
• Jack Lambert
• Jack Chick
• jack cheese
• Jack O' Lantern
• Jack Gets Up
• jackbooted thug
• He's Jack
• Tracey Jacks
• Captain Jack
• Jack of many trades
• I got jacked by the FBI, CNN and amazon.com
• All work and no play makes Jack a dull boy
• Jack Williamson
• Apple Jack
• My Cracker Jack Prize
• Double Jack
• jacks
• Jack Handey
• Candlejack
• Jack Johnson
• jack off
• Jack and the Beanstalk
• Goldie Gold and Action Jack
• Jack and Jill
• Jack in
• Jack Rabbit
• Jumping Jack
• Jack Black (user)
• Jack Black
• Billy Jack
• One Tin Soldier
• Union Jack
• Jack Russell Terrier
• Cracker Jack
• The House That Jack Built
• Jack Be Nimble
• Jack Sprat
• Capt Jack (user)
• Jack Whyte
• Jack Daniel's
• Jack Daniel
• Sand Jack (user)
• Bomb Jack
• Jack Valenti
• Monterey Jack
• Halloween Jack (user)
• Jack Zipes
• Copperfaced Jack
• Copperfaced Jacks
• Jack Pumpkinhead's Ride to the Emerald City
• Jack J (user)
• Jack Jerry (user)
• New Jack City
• Jack Nicklaus
• Jack Flanders
• The House Jack Kerouac Built
• Jack Dracula (user)
• Jack off bulls for a living
• Jack T. Chick Tracts
• Jack Parsons
• Jack London witnesses the San Francisco earthquake
• Jack S. Kilby
• Sailor Jack
• Cruising down Otay, jacked up on Benadryl
• Jack of Speed
• Jack's User Name (user)
• Tanner's Jack
• Jack Armstrong, The All American Boy
• Jumbo Jack
• Jack, his Girlfriend, and the Two Black Eyes
• Jack and the Cigar
• Jack Pierce
• jacked up
• The History of Jack the Giant-Killer
• Ball Jacks
• headphone jacks
• Smilin' Jack
• Ezra Jack Keats
• Ezra Jack Keats Foundation
• Jack of Shadows
• Atom Jack
• Judith Jack
• I am Jack's wasted life
• Jack Gilbert
• Jumping Jack Limited
• There ain't no black in the Union Jack
• Lily, Rosemary, and the Jack of Hearts
• whiskey jack
• Terry Jacks
• Jack McPhee
• The time I jacked the zoo
• Jack Elliot
• Jack E. Volger
• wacky jacks
• Jack Charlton
• Cactus Jack (user)
• Jack Sauce
• Black Jack Davy
• Captain Jack and the Mermaid
• Jack Haggerty
• Jack Mundey
• Jack Tar
• Get Up, Jack! John, Sit Down!
• Jack Was Every Inch a Sailor
• Jack Kerouac's Skull To Be Auctioned Off By Christie's
• Father Jack (user)
• Pallet jack
• Jack Paar
• Jack DeCoster
• Jack Brennan
• Jack Mormon
• Jack Dee
• Jacks of All Trades
• Jack Dennis
• Jack Straw
• You Don't Know Jack 5th Dementia
• Jack Nitzsche
• Jack's Place : Part 1
• Jack McGuire
• Blind Jack
• Fiery Jack
• Jack will speak to you
• I hate to break it to you, President Bush, but $300 ain't jack
• Samurai Jack
• Cactus Jack gets amnesia

If you Log in you could create a "Jack tree" node. If you don't already have an account, you can register here.