Variant spelling of Jane, from Hebrew 'Yochanan' meaning God is gracious.
Jayne is an alternate spelling of Jane, which descended through the Old French Jehane from the Latin Johanna, and ultimately from the Hebrew Yochanan — a compound of Yahweh and chanan (to be gracious), meaning "God is gracious." That heritage places Jayne in one of the largest name families in the Western world, sharing lineage with John, Joan, Jean, Giovanni, Sean, Siobhán, and dozens more. The -y- substitution distinguishes it visually while preserving the identical pronunciation, giving it a slightly more decorative, modern feeling without straying far from the classic.
Jane itself has worn many faces across history — from Jane Austen, whose cool observational wit redefined the English novel, to Jane Eyre, Charlotte Brontë's fiercely self-determining heroine who insisted on her own moral worth in a society that denied it. The variant Jayne carries some of that literary gravity while adding a mid-twentieth century American sensibility. In the United States, the spelling gained visibility through Jayne Mansfield, the platinum-blonde actress and sex symbol of the 1950s whose image was both an embodiment and a parody of Hollywood glamour.
Her larger-than-life persona gave the spelling a somewhat theatrical, attention-commanding quality. In contemporary culture, the name received an unexpected boost from the television series Firefly, in which a gruff, mercenary character named Jayne Cobb — played by Adam Baldwin — became a fan favorite largely because his tough-guy persona clashed amusingly with a name the other characters found incongruous. That comedic dissonance actually highlights something the name's history confirms: Jayne is genuinely gender-flexible.
Today it appears on children of all genders, valued for its simplicity, its slight visual originality over Jane, and its ability to feel both vintage and fresh. It is unpretentious, kind-sounding, and far more interesting than it might first appear.