From Old French Jo(h)anne, and so a doublet of Joan. This too was revived as a given name in its own right in the first half of the 20th century. It has to some extent been influenced by the independently formed combination Jo Anne.
English and Scottish: occupational name for a maker of objects of wood, metal, or bone by turning on a lathe, from Anglo-Norman French torner (Old French tornier, Latin tornarius, a derivative of tornus ‘lathe’). The surname may also derive from any of various other senses of Middle English turn, for example a turnspit, a translator or interpreter, or a tumbler.