Ó Mearáin
Ó MEARÁIN—I—O Mearan, O Meran, Meran, Mearn, Marren, Marron; 'descendant of Mearán' (diminutive of ' mear' lively); a scattered surname, now most frequent in Co. Monaghan, where it is anglicised Marron.
Alphabetical Index to Irish Surnames