おそらくラテン語のiynx、首の曲がった鳥が語源だろう。鳥の首は180度回転し、蛇のようなシビラ音を立てる。これは古代、呪術で占いや呪文を唱えるのに使われ、ひいては不吉、ジンクスにも使われた。
Most mysterious of all in the psychics of baseball is the "jinx," that peculiar "hoodoo" which affects, at times, a man, at other times a whole team. Let a man begin to think that there is a "jinx" about, and he is done for for the time being. ["Technical World Magazine," 1911]The verb is 1912 in American English, from the noun. Related: Jinxed; jinxing.