If it's spelled "Jynx" then the explanation could lie behind the word "lynx" which is latin in origin if I'm not mistaken then this Jame Bond's "Jynx" would be "wryneck+lynx"... Anyway... Try not to trust pop-film etymology (they are in for folk etymology above all)... Probably the
James Bond "Jynx" is based directly upon the "Jinx" word (which I learnt from
Mario RPG... :D Great game :D)... For... I guess... You are refering to "
James Bond" 'cause it's the source of the name upon which you are asking the question... I'm I right or did my guess failed? (bye, have a good time)