Ó Sléibhín
Ó SLÉIBHÍN—I—O Slevine, O Slevan, Slevin, Sleavin, Sleevin, Slevan, Slavin, (?) Slamon; 'descendant of Sléibhín' (diminutive of sliabh, a mountain, a 'pet' diminutive of Donnshléibhe; the name of a branch of the Cinel Eoghain in Ulster. Giolla Chomhghaill Ó Sléibhín, chief bard of Ulster, was the messenger chosen by King Malachy to rally the forces of the North in defence of Tara against Brian Boru.
Alphabetical Index to Irish Surnames