Origin of the name Cade:

Transferred use of the English surname, which is of several derivations. Cade is derived from an Old English nickname for something or someone lumpy or rotund. It might also be from the Late Middle English cade (a young animal abandoned by its mother and raised by hand). Alternatively, Cade is derived from the Middle English cade (cask, barrel) and might have been either a nickname for someone with the physique of a barrel or an occupational name for a barrel maker.

From A World of Baby Names by Teresa Norman.