Hill and mountain names

Bannau Sir Gaer Carmarthenshire peaks
Cadair Arthur Arthur’s chair
Carreg Cennen rock by river Cennen (which itself may derive from ‘cen’ meaning lichen)
Corn Du black stack or black horn?
Cribarth crest of mountain ridge
Disgwylfa watching place
Fan Fawr big peak
Fan Frynych Brynych’s peak
Fan Gyhirych braided peak (probably named after the Nant Gyhirych meaning ‘braided stream’ – which makes more sense)
Fan Hir long peak
Fan Llia peak taking its name from the river (Llia) which itself may derive from ‘lick’ or ‘lap’
Fan Nedd peak taking its name from the river (Nedd) whose meaning is unknown but probably relates to R. Nidd of Yorkshire
Fforest Fach great (hunting) forest
Fforest Fawr little (hunting) forest
Y Mynydd Du the black mountain
Mynydd Illtud St Illtud’s mountain
Pen y Crug top of the hillock
Pen y Fan top of the peak
Tair Carn Uchaf upper three cairns
Trichrug three tumuli / mounds
Twyn y Gaer mound of the fortress