Style: Guys and Dolls, Nicknames, Timeless
Variants: John, Jake
Sisters: Molly, Julia, Caroline, Katie, Tess
Brothers: Joe, Henry, Max, Cole, Samuel
This traditional nickname for John turns the classic upside-down. John is the strong silent type, whereas Jack is a tough but fun-loving bloke. It's an irresistable image to parents, who are flocking to Jack as a given name while John slips out of fashion. Leonardo DiCaprio's heart-throb Jack in the film Titanic helped the cause. The #1 name in England and Ireland.