Thus Nantperis is the name of the village in Gwynedd, but Nant Peris is the name of the stream itself which flows through the village, or the name of the valley.
Felly Nantperis yw enw’r pentref yng Ngwynedd, ond Nant Peris yw enw’r nant ei hun sy’n llifo drwy’r pentref, neu enw’r dyffryn.