Jaynie is a diminutive form of the name Jayne, which itself is a variant of Jane. The name Jane originates from the Old French name Jehanne, which is derived from the Latin name Iohanna, a feminine form of Iohannes, the Latin form of the Greek name Ioannes, ultimately derived from the Hebrew name Yochanan, meaning 'Yahweh is gracious.' Jaynie, as a diminutive, carries a sense of endearment and familiarity, often used in informal contexts.