As a girl's name this is a pet form of Jacqueline, as in the case of Jackie Kennedy Onassis (1929–94). It was originally a boy's name, a pet form of Jack. The racing driver Jackie Stewart (b. 1939) was originally named John Young Stewart.
English: from Middle English kichel, a diminutive of kake ‘cake’, probably applied as a metonymic occupational name for a baker of small cakes of a kind given by godparents to their godchildren when they asked for a blessing.