Glâs, bluish or greyish green.
Glyn, a glen or valley through which a river runs.
Gwern, a watery meadow.
Gwydd, a wood.
Gwyn, white, fair.
Llan, a church, a smooth area, an inclosure.
Llwyn, a grove.
Maen, a stone.
Mawr, great.
Moel, a smooth conical hill.