O'Mulleeny, Mayo O'Quinn, Lord, Londonderry
O'Mullen, Chief, Londonderry O'Quinn, Chief, Tyrone
O'Mulligan, Cavan O'Quinn, Lord, Longford
O'Mulligan, Londonderry O'Quinn, Lord, Limerick
O'Mullins, Clare O'Quinn, Lord, Clare
O'Molloy, Roscommon O'Quinn, Mayo
O'Mulmoghery, Donegal O'Rafferty, Donegal
O'Mulrenin, Mayo O'Rafferty, Tyrone
O'Mulrenin, Chief, Roscommon O'Regan, Chief, Queen's Co
O'Mulrooney, Galway O'Regan, Prince, Meath
O'Mulrooney, Fermanagh O'Regan, Cork
O'Mulroy, Mayo O'Reilly, Prince, Cavan
O'Mulvany, Sligo O'Reilly, Chief, Meath
O'Mulvany, King's Co O'Reilly, West Meath
O'Mulvany, Donegal O'Reilly Longford
O'Mulvey, Chief, Leitrim O'Riordan, Chief, Cork
O'Mulvihil, Roscommon O'Rodaghan, Chief, Leitrim
O'Muready, Chief, King's Co O'Roddan, Mayo
O'Murphy, Lord, Wexford O'Roddy, Donegal
O'Murphy, Cork O'Rody, "
O'Murray, Lord, Mayo O'Rogan, Down
O'Murray, Cavan O'Ronan, Longford
O'Murray, Donegal O'Ronan, Mayo
O'Murray, Chief, Londonderry O'Ronayne, Cork
O'Murrigan, Prince, Kildare O'Rooney, Down
O'Mutagh, Meath O'Rory, Prince, Meath
O'Naghten (or Norton), O'Rothlan, Mayo
Chief, Galway O'Rourke, Prince, Leitrim
O'Neil (or Nihel), Clare O'Ryan, Lord, Carlow
O'Neil, Prince, Donegal O'Ryan, Kilkenny
O'Neil, Lord, Antrim O'Ryan, Limerick
O'Neil, Lord, Down O'Ryan, Lord, Tipperary
O'Neil, Lord, Armagh O'Scanlan, Chief, Louth
O'Neil, King, Prince, O'Scanlan, Kerry
Earl, Tyrone O'Scanlan, Chief, Limerick
O'Neney, Chief, " O'Scannell, Cork
O'Neny, Monaghan O'Scullan, Londonderry
O'Neylan, Chief, Armagh O'Scully, Baron, Meath
O'Neylan Clare O'Scully, Tipperary
O'Nolan, Lord, Carlow O'Scurry, Galway
O'Noonan, Chief, Cork O'Sexton, Tipperary
O'Norton, Chief, Roscommon O'Shanahan, "
O'Quigly, Londonderry O'Shaughnesy, Lord, Galway
O'Quill, Kerry O'Shea, Cork
O'Quinlan, Tipperary O'Shea, Lord, Kerry
O'Quinlan, Kerry O'Shea, Tipperary
O'Quinlevan, Clare O'Shea (or Shee), Kilkenny
O'Quinlevan, Chief, Tipperary O'Sheehan, Kerry
O'Quinn, Chief, Donegal O'Sheehan, Chief, Limerick
O'Sheehan, Galway Prendergast, De, Wexford
O'Sheehan, Donegal Preston, Viscount, Dublin
O'Sheridan, Cavan Purcell, Kilkenny
O'Sheridan, Longford Purcell, Limerick
O'Shiel, Antrim Purcell, Baron, Tipperary
O'Shiel, Chief, West Meath Quigley (see O'Coigley)
O'Sionagh, " Redmond, Wexford
O'Slattery, Kerry Renzy, De, "
O'Slattery, Tipperary Riddell, Down
O'Slevin, Longford Roche, Viscount, Cork
O'Spillan, Tipperary Roche, Limerick
O'Spillane, Sligo Rossiter, Wexford
O'Sullivan, Galway Roth, Kilkenny
O'Sullivan, Lord, Tipperary Russell, Down
O'Sullivan Beare, Russell, Limerick
Prince, Cork Sarsfield, Earl, Dublin
O'Sullivan, Prince, " Sarsfield, Carlow
O'Sullivan More, Lord, Kerry Sarsfield, Cork
O'Talcharan, Mayo Sarsfield, Viscount, Limerick
O'Tarcert, Chief, Donegal Savadge, Lord, Down
O'Teige (or Tighe), Wicklow Seagrave, Dublin
O'Teigue, Tyrone Sinnott, Wexford
O'Tierney, Armagh Sherlock, Waterford
O'Tierney, Lord, Mayo Shortall, Kilkenny
O'Tolarg, Lord, West Meath Skerret, Galway
O'Tomalty, Tyrone Skiddy, Cork
O'Toole, Lord, Kildare Smerwick, Kerry
O'Toole, Prince, Wicklow Smyth, Down
O'Toole, Galway Stack, Kerry
O'Toole, Mayo Stafford, Wexford
O'Tormey, Galway Staunton, Down
O'Tracey, " Staunton, Galway
O'Tracy, Fermanagh Staunton, Mayo
O'Traynor, Meath Strongbow, Carlow
O'Tully, Fermanagh Strongbow, Earl, Wexford
O'Tuohy, Cork Supple, Cork
O'Tuomey, " Sutton, Wexford
Peppard, Louth Synott, Mayo
Petit, Baron, West Meath Taafe, Earl, Louth
Petit, Mayo Taafe, Baron, Mayo
Phepoe, Meath Taafe, Baron, Dublin
Plunket, Baron, Louth Talbot, Wicklow
Plunkett, Cavan Talbot, Earl, Wexford
Plunkett, Earl, Meath Talbot, Waterford
Plunkett, Dublin Tallon, Carlow
Poer, Le, Down Taylor, Dublin
Poer, Le, Lord, Waterford Trant, Kerry
Poer, Le (or Power), " Troy, Limerick
Power, Kilkenny Tuite, Baron, West Meath
Prendergast, Mayo Tuite, Longford
Tyrrell, West Meath Walsh, Kilkenny
Tyrrell, Baron, Dublin Walsh, Waterford
Verdon, De, Louth Walsh, Cork
Verdon, De, West Meath Walsh, Kerry
Vesey, De, Lord, Kildare Walsh, Tipperary
Vesey, De, Lord, Queen's Co Warren, King's Co
Wadding, Waterford White, Down
Wadding, Wexford White, Waterford
Wall, Carlow White, Limerick
Wall, Waterford White, Tipperary
Walsh, Dublin Wogan, Kildare
Walsh, Wicklow Woulfe, Limerick
Walsh, Wexford Wyse, Waterford
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