Ogilvie
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Ogle
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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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Paget (St Feighin's)
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Pakenham
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Pallas/Palles
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Palliser
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Palliser (Longford)
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Palmer
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Palmer (Dunkerron)
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Palmer (Kenure Park)
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Palmer (Leitrim)
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Palmer (Lickmolassy)
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Palmer (Roscrea)
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Palmer (Summerhill)
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Parke
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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)
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Patterson
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Patterson (Kilmacrenan)
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Paul
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Payne
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Peacocke (Barntick)
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Peacocke (Fort Etna)
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Peard
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Pearse (Limerick)
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Peate/Peet
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Pedder
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Peed
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Peile/Piele
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Pelham-Clinton
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Pelly
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Penn
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Pennefather (Ballynera)
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Pennefather (Knockeevan)
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Pennefather (Marlow)
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Pennefather (New Park & Lakefield)
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Penrose
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Penrose (Woodhill)
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Penrose/Penrose Welsted (Shandangan)
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Peppard (Cappagh)
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Pepper
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Perceval
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Perceval
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Perceval (Waterford)
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Percy
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Perdue
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Perkins
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Perrott
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Perry
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Perry (Cork & Waterford)
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Perry (Woodrooff)
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Persse (Roxborough & Moyode)
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Pery
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Pery/ Pery Knox Gore
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