Magh (Celt.), 'a plain;' as Armagh, Maynooth.
Mark (Teut.), 'a boundary;' Denmark, Mercia, Murcia.
Markt (Ger.), 'a market;' as Bibertmarkt.
Medina (Ar.), 'city;' as Medina, Medina-Sidonia.
Mere, Moor (A.S.), 'a lake' or 'marsh;' as Mersey, Blackmore.
Minster (A.S.), Münster (Ger.), 'a monastic foundation;' as Westminster, Neumünster.
Mor (Celt.), 'great;' Benmore ('great mountain').
Mor (Celt.), 'the sea;' as Moray, Armorica, Morlaix, Glamorgan, Morbihan.
Mull (Gael.), 'a headland;' as Mull of Galloway.
Nagy (Hungarian), 'great;' as Nagy-Koros, Nagy-Karoly.