MacConway, Sligo MacGennis, Prince, Down
MacCormac, Tipperary MacGeoghhegan, Lord, West Meath
MacCormac, Lord, Longford MacGeoghhegan, Prince, "
MacCoskley, Tyrone MacGeraghty, Sligo
MacCostello, Mayo MacGereaghty, Mayo
MacCourt, Tyrone MacGettigan, Donegal
MacCourty, Leitrim MacGibbon, Mayo
MacCracken, Londonderry MacGilbride, Donegal
MacCrehan, Kerry MacGilchrist, Longford
MacCrossan, Tyrone MacGildauff, Galway
MacCrossan, Donegal MacGilfinnen, Lord, Fermanagh
MacDavett, " MacGilfoyle, Tipperary
MacDermott, Prince, Roscommon MacGillicuddy of the Reeks,
MacDermott, Prince, Sligo Chief, Kerry
MacDonnell, Chief, Clare MacGilligan, Londonderry
MacDonnell, Chief, Londonderry MacGilligan, Chief, Longford
MacDonnell, Chief, Queen's Co MacGillikelly, Galway
MacDonnell, Kildare MacGilmartin, Leitrim
MacDonnell, Earl, Antrim MacGilmichael, Chief, Monaghan
MacDonogh, Lord, Sligo MacGilmore, Down
MacDonough, Lord, Cork MacGilpatrick, Kilkenny
MacDorchy, Leitrim MacGilroy, Monaghan
MacDougall, Antrim MacGinty, Donegal
MacDowell, Roscommon MacGiollamocholmoge, Lord, Dublin
MacDuvan, Chief, Donegal MacGloin, Leitrim
MacEgan (Brehon), Kerry MacGolrick, Tyrone
MacEgan (Brehon, Tipperary MacGorigal, Donegal
MacEgan (Brehon), Galway MacGorman, Chief, Carlow
MacElligot, Kerry MacGowan (or Smith), Chief, Cavan
MacEneiry, Lord, Limerick MacGowan, Leitrim
MacEnteggart, Fermanagh MacGowan, Donegal
MacEvoy, Armagh MacGowan, Down
MacEvoy, Chief, Queen's Co MacGrane, Meath
MacEvoy, Lord, West Meath MacGreal, Mayo
MacFergus, Leitrim MacGuire, Prince, Fermanagh
MacFineen, Chief Kerry MacGulshenan, "
MacFinnevar, Leitrim MacHale (or MacCail), Mayo
MacFirbis, Sligo MacHugh, Chief, Galway
MacGafney, Cavan MacHugh (or Hughes), "
MacGargan, " MacHugh, Donegal
MacGarrahan, Fermanagh MacHugh, Cavan
MacGarry, Mayo MacHugh, Longford
MacGauran, Lord, Cavan MacIntire, Donegal
MacGavan, Longford MacIntyre, Chief, Tyrone
MacGavan, Mayo MacJordan, de Exeter, Lord, Mayo
MacKenna, Lord, Monaghan MacSweeny, Chief Kerry
MacKenny, Leitrim MacSweeny, Lord, Donegal
MacKenny, Louth MacTaggart, Tyrone
MacKeogh, Wexford MacTei@e, Donegal
MacKeogh, Chief, Roscommon MacTeigue, Carlow
MacKeon, Leitrim MacTeigue, Leitrim
MacKiernan, Lord, Cavan MacTiernan, Fermanagh
MacLennon, Fermanagh MacTienan, Lord, Cavan
MacLeonard, Lord, " MacTully, Fermanagh
MacLoghlin, Prince, Donegal MacTully, Chief, Cavan
MacLoughlin, Londonderry MacTully, Galway
MacLysaght, Clare MacWard, Donegal
MacMahon, Lord, " MacWard, Galway
MacMahon, Lord, Monaghan Maginn, Londonderry
MacMahon, Prince, Monaghan Magrath, Waterford
MacManus, Fermanagh Magrath, Kerry
MacManus, Roscommon Magrath, Clare
MacMurrough, Carlow Magrath, Tipperary
MacMurrough, King, Wexford Magrath, Fermanagh
MacMurrough, Prince, Wicklow Maguirk, Tyrone
MacNally, Antrim Mandeville, Down
MacNally, Mayo Mareschal, Le, Earl, Wexford
MacNamara, Prince, Clare Mareschal, Le, Earl, Kilkenny
MacNamee, Londonderry Martell, Down
MacNeney, Monaghan Martin, Galway
MacNevin, Galway Marward, Baron, Meath
MacNulty, Donegal Masterson, Wexford
MacNulty, Cavan Masterson, Cavan
MacNulty, Mayo Meyler, Wexford
MacOriaghty, Lord, Roscommon Missett, Baron, Meath
MacOscar, Chief, Monaghan Mockler, Tipperary
MacOwen, Tyrone Montmorency, De, Wexford
MacPartlan, Leitrim Montmorency, De, Kilkenny
MacPhillips, Mayo Morgan, Wexford
MacQuade, Monaghan Morris, Waterford
MacQuillan, Lord, Antrim Morris, Tipperary
MacRannall (or Reynolds), Morris, Galway
Lord, Leitrim Mortimer, Lord, Queen's Co
MacRory, Chief, Tyrone Mortimer, De, Lord, Meath
MacRory, Chief, Down Nagle, Cork
MacRuarc, West Meath Nangle, Baron, Meath
MacShane, Chief, Tyrone Nangle, Mayo
MacShanley, Chief, Leitrim Netterville, Baron, Meath
MacSheehy, Limerick Norton (or O'Naghten),
MacSheehy, Chief, Kerry Chief, Galway
MacSheehy, Chief, Cork Nugent, Baron, Meath
MacSherry, Cork Nugent, West Meath
MacSmith, Chief, Cavan O'Ahern, Cork
MacSweeney, Chief, Cork
O'Baire, Chief, Waterford O'Callaghan, Clare
O'Bannan, Chief, King's Co O'Callaghan, Lord, Cork
O'Bannan, Chief, Mayo O'Callaghan, Chief, Mayo
O'Begley, Donegal O'Callaghan, King, Tipperary
O'Begley, Waterford O'Callaghan, Viscount, "
O'Behan, Chief, King's Co O'Callan, Kilkenny
O'Beirne, Chief, Roscommon O'Callan, Armagh
O'Bergin, King's Co O'Callanan, Cork
O'Billry, Limerick O'Callanan. Galway
O'Birn, Mayo O'Canavan, "
O'Bligh, " O'Cannanan, Prince, Donegal
O'Bolger, Kilkenny O'Carbery, Chief, West Meath
O'Boylan, Chief, Monaghan O'Carey, Lord, Kildare
O'Boyle, Lord, Donegal O'Carmody, Clare
O'Bradley, Cork O'Carolan, Chief, Londonderry
O'Branagan, Louth O'Carolan, Meath
O'Bree, Kilkenny O'Carroll, Prince, Tipperary
O'Brennan, Kerry O'Carroll, Chief, Leitrim
O'Brennan, Lord, Kilkenny O'Carroll, Prince, Kilkenny
O'Breslin, Chief, Donegal O'Carroll, Prince, King's Co
O'Breslin (Brehon), Fermanagh O'Carroll, Prince, Tipperary
O'Breslin, Chief, Tipperary O'Carroll, Lord, Kerry
O'Bric, Lord, Waterford O'Carroll, Prince, Louth
O'Brien, Baron, Clare O'Carragher, Louth
O'Brien, Chief, Waterford O'Casey, Cork
O'Brien, King, Prince, O'Casey, Limerick
and Earl, Clare O'Casey, Fermanagh
O'Brien, King, Tipperary O'Casey, West Meath
O'Brien, Lord, Galway O'Casey, Kerry
O'Brien, Lord Tipperary O'Cashin, Galway
O'Brien, Lord, Limerick O'Cassidy, Londonderry
O'Brien, Prince, Limerick O'Cassidy, Monaghan
O'Brigan, Cork O'Cassidy, Chief, Fermanagh
O'Brodar, Chief, Donegal O'Cavanagh, Lord, Carlow
O'Brodar, Lord, Kilkenny O'Cavanagh, Lord, Wexford
O'Brody, Mayo O'Cawley, Chief, Galway
O'Brogan, Cavan O'Claisin, Cork
O'Brogan, Sligo O'Clerkin, Limerick
O'Brogan, Mayo O'Clery, Cavan
O'Brogan, Queen's Co O'Clery, Chief, Donegal
O'Broichan, Chief, Londonderry O'Clery, Lord, Galway
O'Brosnaghan, Kerry O'Coffey, Chief, West Meath
O'Byrne, Lord, Wicklow O'Coffey, Galway
O'Cahaney, Chief, Mayo O'Coigley (or Quigley), Donegal
O'Cahill, Chief, Carlow O'Coleman, Sligo
O'Cahill, Chief, Tipperary O'Coleman, Louth
O'Cahill, Kerry O'Coleman Cork
O'Cahill, Galway O'Colgan, Chief, Kildare
O'Colgan, Down O'Coyle, Cavan
O'Colgan, Armagh O'Coyle, Donegal
O'Colman, Chief, Louth O'Creagh, Cork
O'Coltaran, Down O'Creagh, Clare
O'Conaghty, Sligo O'Creagh, Kerry
O'Conaghty, Cavan O'Crean, Chief, Sligo
O'Concannon, Roscommon O'Criocan, Chief, Tyrone
O'Conealy, Galway O'Criodan, Londonderry
O'Conlan, Limerick O'Cronin, Kerry
O'Connegan, Mayo O'Crossan, Tyrone
O'Connelan, Chief, Tyrone O'Crotty, Chief, Waterford
O'Connelan, Chief, Roscommon O'Crowley, Chief, Cork
O'Connell, Down O'Crowly, "
O'Connell, Clare O'Cuire, Tipperary
O'Connell, Chief, Kerry O'Cuirneen, Leitrim
O'Connell, Chief, Galway O'Cullen, Tipperary
O'Connell, Lord, Limerick O'Cullen, Chief, Limerick
O'Connellan, Mayo O'Cullen, Galway
O'Connolly, Chief, Monaghan O'Cullen, Chief, Wicklow
O'Connolly, Lord, Meath O'Cullen, Kildare
O'Connolly, Galway O'Cullen, Cork
O'Connor, Prince, Kildare O'Cullenan, Chief, Tipperary
O'Connor, King, Roscommon O'Cullenan, Chief, Cork
O'Conor, Prince, King's Co O'Cullenan, Clare
O'Conor, King, Mayo O'Culligan, "
O'Conor, Chief, Galway O'Cummin, Mayo
O'Conor, Prince, " O'Curran, Clare
O'Conor, Mayo O'Curran, Donegal
O'Conor, Lord, Kerry O'Curry, West Meath
O'Conor, Lord, Londonderry O'Curry, Cork
O'Conor, Prince, Kerry O'Daly, Baron, Galway
O'Conor, Lord, Clare O'Daly, Cork
O'Conor, Lord, Sligo O'Daly, Lord, West Meath
O'Conor, Roscommon O'Daly, Kerry
O'Conor Don, " O'Daly, Clare
O'Conor Roe, " O'Daly, Cavan
O'Conran, Chief, Waterford O'Danaher, Cork
O'Considine, Clare O'Davoren, Clare
O'Cooney, Tyrone O'Dea, Chief, Cork
O'Corcoran, Chief, Tipperary O'Dea, Lord, Tipperary
O'Cormac, Down O'Dea, Chief, Clare
O'Corr, Roscommon O'Deasy, Cork
O'Corran, Tyrone O'Deegan, Clare
O'Corrigan, Fermanagh O'Delany, Chief, Kilkenny
O'Cosgry, Chief, Wexford O'Delany, Kerry
O'Crowley, Chief, Cork O'Dempsey, Lord, Queen's Co
O'Crowly, " O'Dempsey, Kildare
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