Submitted NameRevisions Save Type Settlement Usage Welsh Pronounced Pron. Tre-dee-gar [key] Other Forms FormsTref-deg-ewr (Old Welsh) Edit Status Status [show contributorshide contributors] Added 7/3/2016 by McLeeds Edited 5/17/2017 by McLeeds Meaning & History A town in South-East Wales. Its name derives from the Old Welsh tref, which means 'town' or traditionally 'farm, estate', and degewr, which meant 'ten acres'.