 The name of the river Glan is also of Celtic origin.In a 1267 document from the Remigiusberg Monastery, the name Ulmet appears for the first time, as "Olmone".Other forms of the name that have cropped up over time are "Olmut" (1364), "Olmüth" (1387), "Olmud" (1416), "Olmaon", "Olmont" (1422), "Olmudt" (1436), "Olmut" (1446), "Ollemont" (1456), "Olmud" and "Olmudt" (1460), "Olmuett" (1477), "Olmüt" (1480), "Olmeth" (1544), "Ulmeth", "Ulmüth" (1588), again "Olmeth" (1634), "Ulmeth" (1756) and beginning about the mid 19th century, with the dropping of the H at the end (which was not pronounced anyway), the modern spelling appeared.