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O'Kelly (Gortray/Fairfield)
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O'Leary (Cork)
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O'Loghlen
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O'Mahony (Templevally)
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O'Malley (Ballynalacka)
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O'Malley (Eden)
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O'Malley (Galway)
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O'Malley (Hawthorn)
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O'Malley (Kilboyne)
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O'Malley (Kilmilkin)
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O'Malley (Newcastle)
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O'Meagher/Meagher
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O'Meara
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O'Neill
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O'Neill (Parkhill)
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O'Reilly
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O'Reilly (Cavan)
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O'Reilly (Colmanstown)
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O'Reilly (Drumbannow)
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O'Reilly (Heath House)
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O'Reilly Dease
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O'Rorke (Clonbern & Bermingham)
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O'Rorke (Oldcastle)
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O'Ryan (Bansha Castle)
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O'Shaughnessy (Creagh)
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O'Shaughnessy (Gort)
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O'Shea (Limerick)
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O'Sullivan
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O'Sullivan (East Carbery & Bear)
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O'Sullivan (Limerick)
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O'Sullivan (West Cove)
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O'Sullivan Beare
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Ogilby
|
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Ogilvie
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Oldfield
|
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Oliver (Castle Oliver)
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Oliver (Cos Galway & Leitrim)
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Oliver (Inchera & Dunkettle)
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Oliver (Kerry & Cork)
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Olphert/Olpherts
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Olpherts
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Onge
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Orme (Abbeytown & Glenmore)
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Orme (Ballycarron)
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Orme (Owenmore)
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Ormsby (Athlacca)
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Ormsby (Ballinamore)
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Ormsby (Bird Hill & Brookdale)
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Ormsby (Castle Dargan)
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Ormsby (Cummeen)
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Ormsby (Farrenmacfarrell)
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Ormsby (Gortnaraby)
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Ormsby (Rinagry)
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Ormsby (Rocksavage)
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Ormsby (Tireragh)
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Ormsby (Tobervaddy)
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Ormsby Gore
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Ormsby Ruttledge
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Orpen (Elm Park)
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Orpen (Glanarought)
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Orpen (Killaha Castle)
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Orpen/Orpin (Cos Cork & Waterford)
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Orr
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Orr (Banagh)
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Osborne
|
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Osborne (Newtown Anner & Beechwood)
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Oswald
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Otway
|
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Ouseley
|
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Owen (Raconnell)
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Paget
|
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Pakenham
|
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Pallas/Palles
|
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Palliser
|
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Palmer
|
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|
Palmer (Dunkerron)
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|
Palmer (Kenure Park)
|
|
|
|
Palmer (Leitrim)
|
|
|
|
Palmer (Lickmolassy)
|
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|
|
Palmer (Roscrea)
|
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|
|
Palmer (Summerhill)
|
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|
Parke
|
|
|
|
Parker (Ballineadig)
|
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Parker (Castlelough & Ballyvalley)
|
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Parker (Green Park)
|
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Parker (Passage West)
|
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|
Parker (Whiteway, Devon)
|
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Parnell (Rathleague)
|
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|
Parsons
|
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Parsons
|
|
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|
Parsons (County Waterford)
|
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|
Parsons (Cragbeg)
|
|
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|
Paterson (Kilmacrenan)
|
|
|
|
Patterson
|
|
|
|
Patterson (Kilmacrenan)
|
|
|
|
Paul
|
|
|
|
Payne
|
|
|
|
Peacocke (Barntick)
|
|
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|
Peacocke (Fort Etna)
|
|
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Peard
|
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|
