gooseberry: [16] Probably, when all is said and done, gooseberry is simply a compound of goose and berry. But no one has ever been able to explain satisfactorily why the gooseberry should have been named after the goose, and there has been no lack of alternative etymological suggestions for the word – notably that goose is an alteration of an old dialect word for the ‘gooseberry’, such as groser or gozell, borrowed ultimately from French groseille ‘gooseberry’.
The quaint alteration goosegog dates from at least the early 19th century. Play gooseberry ‘be an uncomfortably superfluous third person with two lovers’ also goes back to the early 19th century, and may have originated in the notion of a chaperone (ostensibly) occupying herself with picking gooseberries while the couple being chaperoned did what they were doing (gooseberry-picker was an early 19th-century term for a ‘chaperone’). [gooseberry etymology, gooseberry origin, 英语词源]