O'Kielty or Quilty
O'Kiely
O'Kieran, Kearns, Kearon
O'Killeen
O'Kinahan
O'Kindelan
O'Kinealy
O'Kirby
O'Kirwan
O'Kyan
O'Lalor or Lawler
O'Langan
O'Lanigan or Lenigan
O'Larkin
O'Lavin
Olde
O'Leahy
O'Leary
O'Lehane or Leehan
O'Lenihan or Lenaghan
O'Lennon
Oliver
Oliver (Ulster)
O'Lonergan
O'Looney or Lunny
O'Loughlin I
O'Loughlin II
O'Loughnan
O'Mackesy
O'Mackey
O'Madden
O'Mahony
O'Malley
O'Mallun or Mullan
O'Malone
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