"The earlier name for Cûm Arelaid was "Umb Dolen". According to the learned work of Lamhir the Wise, the word "umb", "vale", in this name was borrowed by early Númenórean explorers from the Daenael speech spoken of the Men of the White Mountains. "Umb" was only found in a few provincial place-names of very ancient lineage; in names of more recent origin, "umb" has been supplanted by "Cûm", a word from the modern Dunael tongue descended from the ancient ancestor Daenael. Lamhir also proposes that both "umb" and "Cûm" are distantly akin to Quenya "tumbo", "valley", and Sindarin tum,though we find the suggestion of any connection, however remote, between the noble Elven-tongues and the crude jargons of the mountain-folk to be distasteful" -Findegil