An Etymological Dictionary of the German Language/Moor
Moor, m. and n., ‘moor,’ ModHG. only, from LG. môr; comp. Du. moer, OSax. môr, n., AS. môr, n., ‘moor, swamp,’ E. moor; corresponding to OHG. and MidHG. muor, n., ‘swamp,’ seldom ‘sea’; scarcely akin to OIc. mó-r (gen. mó-s), m., ‘moor, dry heath’ OHG. muor, as well as AS. môr (Goth. *môra- is wanting), is rather relate by gradation to Meer, OHG. męri, AS. męre, Goth. marei,. or, if r is derived by rhotacism from s, the cognates are connected with OHG. and MidHG. mos, ‘swamp’; this, however, after the remarks made under Moos, is hardly probable.