Erwan Vallerie ː Mousterguezenou, 1260; Monasterio Guezenoci, 1371; Moustoerguehenou, 1387; Monster Gheheneuc, 1422; Moustoir Guehonno, 1429; Gueheno, Monstoërgueheno, 1453; Gueheno, 1501; Guechenno, 1516; Guehenno, 1554; Guezhenou, 1558; Gueheuo, 1630