Ó Cochláin
Ó COCHLÁIN—I—O Coghlaine, O Coughlane, Coghlan, Coughlan, Coughlin, Coghlin, Colin, &c.; 'descendant of Cochlán' (diminutive of cochal, a cape or hood); an ancient and still common surname in Co. Cork; to be distinguished from Ó Cathaláin, which see.
Alphabetical Index to Irish Surnames