 The name of the combined estuary – the Daugleddau – means “the two Cleddaus”.The name Cleddau, whilst seeming to be a plural ('-au' generally denotes plurality in Welsh) comes from the Welsh word "cleddyf" meaning 'sword' and refers perhaps to the manner in which both rivers are incised into the landscape of Pembrokeshire.A number of former Anglican parishes in the area have been combined to form the modern Church in Wales parish of Daugleddau in the Diocese of St Davids.