Morphology: from cwm+corrog
Phonetic: comb-corr-oog
A settlement just outside Argoed, the area gets its name from the location "in the valley of the little river". The word "corrog" is an adjective meaning "dwarf" or "little" and is found in other place names such as Glyncorrwg in the Afan Valley, north of Port Talbot and in its feminine form in Corris in Meirionydd. Cwm Corrwg was one of very few settlements in the area to be shown on maps of Glamorganshire, such as on one printed by Eyre and Spottiswoode of London in 1885. The bridge across the Sirhowy river is shown as Pont-Cwm-corrwg on more detailed maps dating back to 1879.