O'Quinane
O'Quinlan
O'Rafferty
![O'Raughter [Kilkenny] coat of arms O'Raughter [Kilkenny] family crest](../jpg/raughter-rafter-wrafter-raftiss-kilkenny.jpg)
O'Raughter [Kilkenny]
O'Regan
O'Reidy O'Riada
O'Renehan
O'Riall
O'Ring O'Rynn
O'Ring O'Rynn
O'Riordan O'Rearden
Orleston
![Orme [Mayo] coat of arms Orme [Mayo] family crest](../jpg/orme-mayo.jpg)
![Ormsby [Ireland] coat of arms Ormsby [Ireland] family crest](../jpg/ormsby-ireland.jpg)
Orme [Mayo]
Ormerod
Ormond
Ormsby [Ireland]
O'Roe
![O'Ronan O'Ronayne [Limerick] coat of arms O'Ronan O'Ronayne [Limerick] family crest](../jpg/ronan_limerick.jpg)
Oron
Oron
O'Ronaghan
O'Ronan O'Ronayne [Limerick]
O'Rooney
O'Rooney
![Orpen [Kerry] coat of arms Orpen [Kerry] family crest](../jpg/orpen-kerry.jpg)
![Orpie [Dublin] coat of arms Orpie [Dublin] family crest](../jpg/orpie-dublin.jpg)
O'Rooney
O'Rourke
Orpen [Kerry]
Orpie [Dublin]
Orr
Orttenfels