Ó Nialláin
Ó NIALLÁIN—I—O Nillane, O Neilane, O Nelane, O Neylane, Nilan, Nelan, Neilan, Nealon, Neylan, Neylon, Nilon, Niland, Neiland, Neyland, Neelan, Neeland, Neelands, &c.; 'descendant of Niallán' (diminutive of Niall); a Thomond surname; now also common in Connacht.
Alphabetical Index to Irish Surnames