O'Dempsey, Viscount, O'Dorin, Donegal
and Baron, King's Co O'Dorrian, "
O'Dennehy, Waterford O'Dowd, Prince, Sligo
O'Dennery, Cork O'Dowd, Prince, Mayo
O'Dermody, Tipperary O'Dowling, Chief, Queen's Co
O'Dermody, Clare O'Dowling, Chief, Wicklow
O'Devin, Lord, Fermanagh O'Doyle, Galway
O'Devir, Donegal O'Doyle, Kilkenny
O'Devlin, Sligo O'Doyle, Wexford
O'Devlin. Chief, Londonderry O'Doyle, Chief, Wicklow
O'Dinane, Cork O'Doyle, Carlow
O'Dinan, Tipperary O'Doyne, "
O'Dineen, Cork O'Dreenan, Galway
O'Dinerty, Tipperary O'Drinan, Clare
O'Dinnahan, Chief, Limerick O'Driscoll, Lord, Cork
O'Dogherty, Lord, Donegal O'Duane, Galway
O'Dogherty, Mayo O'Duff, Chief, Queen's Co
O'Dolan, Cavan O'Duffy, Donegal
O'Dolan, Mayo O'Duffy, Galway
O'Donnelly, Chief, Donegal O'Duffy, Chief, Monaghan
O'Donevan, Limerick O'Duffy, Mayo
O'Donlevy, Tyrone O'Dugan, Chief, Wexford
O'Donlevy, Prince, Down O'Dugan, Roscommon
O'Donnegan, Fermanagh O'Dugan, Chief, Cork
O'Donnegan, Chief, Tyrone O'Dugan, Mayo
O'Donnegan, Armagh O'Duigenan, Roscommon
O'Donnegan, Prince, Tipperary O'Dunn, Chief, Kildare
O'Donnellan, Lord, Galway O'Dunn, Lord, Meath
O'Donnellen, Lord, Antrim O'Dunn, Lord, Queen's Co
O'Donnelan, Roscommon O'Dunnady, Kerry
O'Donnell, Prince, Sligo O'Durkan, Sligo
O'Donnell, Mayo O'Davan Chief, , Meath
O'Donnell, Galway O'Duvany, Chief, Tyrone
O'Donnell, Prince, Donegal O'Duvany, Chief, Armagh
O'Donnelly, Chief, Tyrone O'Dwyer, Lord, Tipperary
O'Donnelly, Chief, Tipperary O'Early, Donegal
O'Donoghoe, Kerry O'Eire, Antrim
O'Donoghoe Mor, Prince, " O'Etigan, Chief, Tyrone
O'Donoghoe, Prince, Kilkenny O'Fahy, Galway
O'Donoghoe, Prince, Tipperary O'Fallon, Roscommon
O'Donovan, Lord, Limerick O'Falvey, Cork
O'Donovan, Lord, Cork O'Falvey, Lord, Kerry
O'Donovan, " O'Farrelly, Chief, Cavan
O'Dooley, Chief, West Meath O'Fay, West Meath
O'Doolin, Kerry O'Feenaghty, Kerry
O'Dooyarma, Lord, Donegal O'Feenaghty, Lord, Roscommon
O'Doran (Brehon), Wexford O'Feeney, Sligo
O'Doran, Chief, Carlow O'Felan, Fermanagh
O'Felan, Waterford O'Glennon, Roscommon
O'Ferral, Prince, Longford O'Gloran, Chief, Kilkenny
O'Fihelly, Cork O'Gogarty, Meath
O'Fihelly Roscommon O'Gorman, Chief, Clare
O'Finan, Mayo O'Gorman, Carlow
O'Finegan, " O'Gorman, Fermanagh
O'Finegan, Sligo O'Gormley, Chief, Donegal
O'Finnelan, Lord, Meath O'Gormly, Mayo
O'Finn, Leitrim O'Gormoge, Chief, "
O'Flahavan, Waterford O'Grady, Lord, Clare
O'Flaherty, Lord, Galway O'Grady, Kerry
O'Flannagan, Lord, Fermanagh O'Grady, Viscount Limerick
O'Flannagan, Waterford O'Grady, Mayo
O'Flannagan, Lord, Roscommon O'Griffin, Cork
O'Flannelly, Lord, Sligo O'Griffin, Clare
O'Flannery, Limerick O'Hagan, Chief, Tyrone
O'Flannery, Mayo O'Hagarty, Kerry
O'Flattery, Clare O'Hagarty, Chief, Londonderry
O'Florry, Down O'Hagerty, Donegal
O'Flynn, Lord, Antrim O'Halahan, Cork
O'Flynn, Chief, Cork O'Halligan, Meath
O'Flynn, Lord, Roscommon O'Halliman, Chief, Limerick
O'Flynn, Cork O'Halloran, Clare
O'Flynn, Kerry O'Halloran, Chief, Galway
O'Flynn, Mayo O'Hamill, Antrim
O'Fogarty, Tipperary O'Hamill, Chief, Tyrone
O'Foley, Kerry O'Hanley, Chief, Roscommon
O'Forranan, Chief, Donegal O'Hanlon, Lord, Armagh
O'Fox, Meath O'Hanrahan, West Meath
O'Fox, West Meath O'Hanratty, Chief, Armagh
O'Fox, Chief, Longford O'Hanvey, Chief, West Meath
O'Freel, Donegal O'Hanvey, Down
O'Freel, Chief, Londonderry O'Hara, Baron, Mayo
O'Furey, Tipperary O'Hara, Lord, Mayo
O'Furry. Antrim O'Hara, Antrim
O'Fynn, Clare O'Hara, Lord, Sligo
O'Gahan, Lord, Wicklow O'Harkan Donegal
O'Gallaher, Chief, Donegal O'Harney, Chief, Kerry
O'Gallivan, Kerry O'Hart, Chief, Sligo
O'Gara, Lord, Sligo O'Hart, Prince, Meath
O'Garvey, Chief, Down O'Hartigan, Cork
O'Garvey, Chief, Armagh O'Hartigan, Limerick
O'Garvey, Chief, Wexford O'Harty, Queen's Co
O'Gavagan, Sligo O'Haverty, Chief, Galway
O'Gavagan, Mayo O'Hea, Chief, Limerick
O'earan, Galway O'Hea, Chief, Meath
O'Geary, Waterford O'Hea, Chief, Cork
O'Gevany, Galway O'Healy, Kerry
O'Gleeson, Tipperary O'Healy, Cork
O'Heaney, Chief, Fermanagh O'Keefe, Lord, Cork
O'Heffernan, Tipperary O'Keeley, Clare
O'Heffernan, Clare O'Keely, Tipperary
O'Hehir, Chief, " O'Keenan, Chief, Fermanagh
O'Heir, Chief, Armagh O'Keenan, Londonderry
O'Hely, Limerick O'Keerin, Mayo
O'Hennessey, Chief, King's Co O'Keevan. Sligo
O'Hennessy, Chief, West Meath O'Keevan, Antrim
O'Hennigan, Cork O'Keiran, Chief, Armagh
O'Heoghy, Chief, Down O'Kelleher, Tipperary
O'Herlihy, Cork O'Kelleher, Cork
O'Heyne, Prince, Galway O'Kelleher, Kerry
O'Heyne, Cork O'Kelly, Prince, Galway
O'Hickey, Chief, Tipperary O'Kelly, Prince, Roscommon
O'Hickey, Clare O'Kelly, Prince, Meath
O'Higgin, Mayo O'Kelly, Prince, Dublin
O'Higgin, Chief, West Meath O'Kelly, Lord, Kildare
O'Higgin, Longford O'Kelly, Chief, Wicklow
O'Hoey, Monaghan O'Kelly, Chief, Queen's Co
O'Hoye, Chief, Down O'Kelly, Chief, Down
O'Hogan, Chief, Tipperary O'Kelly, Chief, Tyrone
O'Hogan, Clare O'Kelly, Chief, Louth
O'Honan, Limerick O'Kennedy, Kerry
O'Honeen, Clare O'Kennnedy, Lord, Tipperary
O'Hoollaghan, Chief, Galway O'Kenny, Chief, Donegal
O'Hoollaghan, King's Co O'Kernaghan, Chief , Sligo
O'Hoollaghan, Cork O'Kernaghan, Donegal
O'Horan, Chief, Galway O'Kerrigan Mayo
O'Horan, Wicklow O'Keveny, Kilkenny
O'Horgan, Cork O'Killeen, Mayo
O'Hosey, Fermanagh O'Kindellan, Prince, Meath
O'Hosey, Tyrone O'Kinealy, Chief, Limerick
O'Howley, Sligo O'Kinsellagh, Carlow
O'Howley, Chief, Clare O'Kirwan, Galway
O'Hugh, Donegal O'Kirwick, Limerick
O'Hurley, Tipperary O'Lanigan, Chief, Tipperary
O'Hurley, Cork O'Largnan, Down
O'Hurley, Limerick O'Larkin, Galway
O'Hynes, Galway O'Larkin, Lord, Wexford
O'Kane, Prince, Londonderry O'Larkin, Chief, Armagh
O'Kane, Lord, Antrim O'Larrissey, Mayo
O'Kean, Galway O'Lavell, Mayo
O'Kean, Chief, Tipperary O'Laverty, Donegal
O'Kearney, " O'Laverty, Lord, Tyrone
O'Kearney, Chief, Clare O'Lawlor, Chief, Queen's Co
O'Kearney, Chief, West Meath O'lawlor, Down
O'Kearny, Mayo O'Lawry, Chief, "
O'Kearny, Cork O'Leahan, Galway
O'Leahy, Kerry O'Meagher, Lord, Tipperary
O'Leaney, Chief, Donegal O'Meaney, Roscommon
O'Leary, Lord, Cork O'Meara, Chief, Tipperary
O'Lee, Galway O'Meehan, Chief, Leitrim
O'Lehan (or Lyons),Lord, Cork O'Meehan, Tipperary
O'Lenahan, Chief, Tipperary O'Meehan, Fermanagh
O'Lennon, Mayo O'Meehan, Sligo
O'Lennon, Galway O'Malaghlin, King, King's Co
O'Leyne, Kerry O'Malaghlin, Prince, West Meath
O'Liddy, Clare O'Mellan, Chief, Tyrone
O'Loan, Tyrone O'Milford, Mayo
O'Loghlin, Clare O'Moghan, "
O'Loghnan, Mayo O'Molloy, Prince, King's Co
O'Loman, Roscommon O'Moloney, Chief, Clare
O'Loman, Galway O'Monahan, Chief, Roscommon
O'Lomasey, Cork O'Mongan, Sligo
O'Lonergan, Chief, Tipperary O'Mooney, Chief, Queen's Co
O'Longan, Down O'Mooney, Chief, King's Co
O'Looney, Cork O'Moore, Chief, Down
O'Loughnan, Mayo O'Moore, Prince, Queen's Co
O'Loughnan, Down O'Moore, Lord, Carlow
O'Loughnan, Kilkenny O'Moore, Kerry
O'Luinin, Fermanagh O'Moran, Roscommon
O'Lunney, Chief, Tyrone O'Moran, Mayo
O'Lynch, Cavan O'Moran, Galway
O'Lynch, Clare O'Moran, Down
O'Lynch, Tipperary O'Moran, Sligo
O'Lynch, Cork O'Moriarity, Chief, Kerry
O'Lynch, Down O'Morony, Chief, Clare
O'Lynch, Donegal O'Morony, Cork
O'Lynchy, Donegal O'Morony, Chief, Limerick
O'Macken, Down O'Morrissey, Tipperary
O'Makesey, Limerick O'Morrissey, Sligo
O'Mackey, Tipperary O'Morrisson, "
O'Madden, Lord, Galway O'Morrisson, Donegal
O'Madden, Chief, King's Co O'Moynagh, Sligo
O'Maginn, Galway O'Mulcahy, Chief, Tipperary
O'Mahon, Down O'Mulcahy, Limerick
O'Mahony, Lord, Cork O'Mulclohy, Lord, Sligo
O'Mahony, Chief, Kerry O'Muldoon, Chief, Fermanagh
O'Malbride, Roscommon O'Muldorry, Prince, Donegal
O'Malley, Lord, Mayo O'Mulfinny, Longford
O'Malone, West Meath O'Mulgee, Donegal
O'Malquiney, Tipperary O'Mulholland, Antrim
O'Manning, Chief, Galway O'Mullally, Lord, Galway
O'Maol Conroy, Chief, Roscommon O'Mullane, Waterford
O'Mullany, Sligo O'Mullane, Chief, Kerry
O'Markey, Louth O'Mullany, Waterford
O'Marron, Armagh O'Mullarky, Galway
O'Marron, Monaghan O'Mulleady, West Meath
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