De Montáin
de MONTÁIN—XI—Montaine, Montayn, Montane, Mountain, etc.; Norman 'de la Montayne,' i.e., of the mountain (Old French montaine, modern French montagne), from residence thereby; a rare Norman surname, found chiefly in Co. Cork. To be distinguished from Ó Manntáin, which see.
Alphabetical Index to Irish Surnames