Submitted NameRevisions Save Type Settlement Usage Welsh Edit Status Status [show contributorshide contributors] Added 6/5/2016 by LMS Edited 12/28/2019 by Frollein Gladys Meaning & History Cwm Gwaun (English: Gwaun Valley) is a community and valley in north Pembrokeshire, Wales. The name itself is derived from Welsh cwm "valley" and gwaun "heath, moor".