There is an isle of Cumbrae on the Ayrshire coast in Scotland. However, given the mining link, I suggest you look at Cwmbran in Wales which is known for coal mining. Also, the name Cwmbran natrually splits into "Cwm" and "bran". I'm not a Welsh speaker but I imagine a native speaker might well pronounce this name with a tiny pause. Unfortunately, a cursory search on ancestry reveals no Bells in Cwmbran.