I notice there's a Eglwyswen (Whitchurch, 'white church') nearby. The name could contain other than a saint's name, n'est-ce pas? White in Welsh is gwyn, which after soft mutation gives us wyn, or in this case (?) wen. Is it possible that the second part of the compound is something like gwrw or geirw? I'm not sure. Probably should just have Mav ask one of the local historians or pastors at one of the churches. BTW, Sanskrit guru means 'heavy' literally, as well as 'teacher'. Related to Latin gravitas.