The story
From Welsh; the words imply the meaning boar valley but Welsh twrch derives from a verb and thus it may refer to the central river digging through the valley.
Etymology from Wiktionary, CC BY-SA 4.0.
Cwmtwrch
Today it means: A village and ward in Ystradgynlais community, southern Powys, Wales (OS grid refs SN7610, SN7511). Full definition →