Ó Cuanacháin
Ó CUANACHÁIN—I—O Coonaghan, Coonaghan, Coonahan, Coonihan, Counihan, (Cooney); 'descendant of Cuanachán' (diminutive of Cuana); a rare surname, now found chiefly in Kerry; anglicised Cooney in some parts of Munster.
Alphabetical Index to Irish Surnames