Jack Daniels Flathead I, a younger second cousin of John D. & John Paul Flathead, was so named because his father was convinced "That John thing worked with my cousin's kids." Jack Daniels made his fortune through FrobozzCo affiliates, which included a racing concession in Flatheadia and a whiskey distillery which sold for the same price as its competitors but rewarded both buyers & seller's a half-off their next tax bill coupon.

Jack Daniels had a long line of descendants. Jack Daniels XIII lived during the Great Monster Uprising of the Second Age of Magic.

SOURCE(S): Legends of Zork (personal correspondence from the author of 'A Wizard and His Cocoa' quest)