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O'Conor (Mount Druid)
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O'Conor (Toomona)
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O'Conor Don
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O'Conor Donelan
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O'Dell (Waterford)
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O'Dell/Odell
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O'Dell/Odell (Kilcleagh)
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O'Doherty
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O'Donel
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O'Donel (Newcastle)
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O'Donnell (Boyle)
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O'Donnell (Kilcommon Erris)
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O'Donnell (Kilsheelan)
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O'Donnell (Larkfield)
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O'Donnell (Swineford)
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O'Donnell (Trough)
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O'Donoghue
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O'Donovan
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O'Donovan (East Carbery)
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O'Donovan (Kilcrohane)
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O'Dowd (Bunnyconnellan)
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O'Dowd (Tully)
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O'Driscoll (West Carbery)
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O'Dwyer (Caher)
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O'Dwyer (Co Tipperary)
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O'Dwyer (Kilmurry)
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O'Farrell/Farrell (Dalystown Demesne)
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O'Farrrell (Youghal)
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O'Ferrell [O'Farrell](Longford)
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O'Flahertie (Lemonfield)
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O'Flaherty (barony of Longford)
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O'Flaherty (Knockbane)
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O'Flaherty (Lisdonagh)
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O'Flaherty (Renvyle)
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O'Flynn
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O'Gorman (Belleview)
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O'Gorman (Buncraggy)
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O'Gorman (Ennis)
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O'Grady (Abbeyfeale)
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O'Grady (Aghamarta)
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O'Grady (Cahir Guillamore)
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O'Grady (Castle Garde)
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O'Grady (County Cork)
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O'Grady (Errina)
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O'Grady (Kichreest)
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O'Grady (Kilballyowen)
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O'Grady (Lismoyle)
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O'Grady (Tavraun)
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O'Grady/Grady (Belmont)
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O'Grady/Grady (Elton)
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O'Grady/Grady (Glendalough)
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O'Grady/Grady (Graffin)
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O'Grady/Grady (Landscape)
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O'Grady/Grady (The Grange)
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O'Halloran
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O'Hara
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O'Hara
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O'Hara (Ballyara & Corsallagh)
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O'Hara (Lenaboy)
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O'Hara (Mornington)
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O'Hara (Raheen)
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O'Hare
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O'Hea
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O'Heney/Heney
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O'Keeffe
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O'Keeffe (Templemore)
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O'Keeffe (Waterford)
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O'Kelly (Clonina)
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O'Kelly (Creeraun)
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O'Kelly (Gallagh & Ticooly)
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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 (Ballymahon)
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O'Reilly (Cavan)
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O'Reilly (Colmanstown)
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O'Reilly (Coolamber)
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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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