From English 'jinx' (a charm or spell), ultimately from Greek iynx, the wryneck bird used in magic.
Few names carry as much mythological freight in a single syllable as Jinx. The word descends from "jynx," the Latin and Greek name for the wryneck bird (Jynx torquilla), a creature whose eerie, serpentine neck movements made it a prized instrument in ancient love magic and cursing rituals. Ancient Greek witches would fasten the bird to a spinning wheel to cast binding spells — the "iynx" — and from this practice the word for a hex entered the Western vocabulary.
As a personal name Jinx took root in twentieth-century America, riding the same irreverent wave that gave us Lucky, Bucky, and Sunny. The actress Jinx Falkenburg, a 1940s pinup and radio personality, lent it mainstream visibility, and the name became a byword for a certain devil-may-care glamour. It received a sharp cultural boost in 2002 when the Bond film "Die Another Day" introduced Jinx Johnson, played by Halle Berry — a character whose name announced both danger and charm.
Today Jinx occupies an interesting double life: it is the name of beloved fictional villains (the DC Comics sorceress, the "League of Legends" champion), yet it also functions as a genuine, joyfully nonconforming given name. Parents choosing Jinx tend to embrace its bite, its brevity, and its refusal to apologize for itself.