Erwan Vallerie ː Cletguenn, 1081; Rupes Cletguen, 1081; Cleven, 1108; Rogcleufen, 1260; Clezguen, XIIIvet; Rescleguen, 1288; Cletguin Pochaer, c. 1330; Cletguen Pocher, 1368; Cletguen Pochaer, 1516, 1536, 1574; Cleduan, 1630; Cledent, 1636; Cleduen, 1654