Never heard it before....but Welsh sounds about right; they like to have one vowel for every 12 consonants. My father's middle name is Welsh; 4 l's, 1 y, and 2 e's: Llewellyn. Too many vowels!A cwm is a mountaineering term (or at least that is where I learned it) for a cirque, or a mountain basin. I think it might be Welsh, which would make sense, with their penchant for consonants.