Derwa

Likely derived from Cornish derow "oak trees" (ultimately from Proto-Celtic *daru "tree"). Saint Derwa is the patron saint of Menadarva (Merther Derwa in Cornish, translating to grave of St Derwa in English) in the parish of Camborne, Cornwall. Nothing is now known about this saint, not even their gender. There have been speculations that Saint Derwa might have been and a man and in fact none other than Saint Dyfan. In modern times, however, this name has been resurrected as a feminine name.