gasket: [17] Although it has never been established for certain, it seems likely that gasket may have originated as a word meaning ‘little girl’ – namely French garcette. This is a diminutive of grace ‘girl’, the feminine form of gars ‘boy’ (whence garçon). It is used figuratively for a ‘small rope’, and was originally borrowed into English in the 17th century as gassit, used as a nautical term for a ‘small rope for attaching a furled sail to a mast’.
Modern English gasket, first recorded in the early 17th century, seems to be an alteration of this. The main present-day sense ‘joint seal’ (originally made from tow or plaited hemp) developed in the early 19th century. [gasket etymology, gasket origin, 英语词源]