What's Jimmy Short for?

Jimmy is a male given name. It is a diminutive form of the given name James, along with its short form, Jim.

Is Jack Short for Jimmy?

Origin. Jack is thought by some to have hailed from the earlier Jackin (from the name Jankin). Alternatively, it may be derived from the name Jacques, the French form of the name James or Jacob.

Why is James Short for Jim?

People wanted a shorter more familiar way to call people named James and the vowel changed because Jim sounds better than Jam. Jimmy came later not for brevity, but because people presumably wanted a cuter, even more familiar way to refer to children and friends who were already called Jim.