Families in Ireland from the 11th century to the end of the 16th century.   According to "A Topographical and Historical Map of Ancient Ireland,"compiled by Philip MacDermott, M.D., the below listed names represented the principal families in Ireland, of Irish, Anglo-Norman, and Anglo-Irish origin. Note how many Os and Macs there are. This list also includes which families had chiertainships Name County ARCHBOLD, Wicklow ARCHER, Kilkenny AUDLEY, Down AYLMER, Kildare BAGOTT, Dublin BARNEWELL, " BARNWALL, Baron, Meath BARNWALL, Louth BARNWALL, Cork BARRETT, Lord, " BARRETT, Mayo BARRON, Waterford BARRY, Baron, Cork BARRY, Earl, " BARRY, Lord, " BARRY, Oge, " BATHE, De, Meath BELLEW, Baron, " BELLEW, Louth BETAGH, Meath BIRMINGHAM, Baron, Galway BIRMINGHAM, Baron, Kildare BIRMINGHAM, De, Louth BISSET, Antrim BLAKE, Baron, Galway BODKIN, " BOURKE, MacWilliam, Lord, Mayo BRPW, Baron, Galway BROWNE, Baron, Mayo BROWNE, " BROWNE, Limerick BROWNE, Wexford BURGH, De, Earl, Galway BURGO, De, Earl,DEBURGO Antrim BURGO, De, Earl, Down BURGO, De, Lord, Tipperary BURGO, De, Viscount, Galway BURKE, Baron, Limerick BURKE, Baron, Galway BURKE, Earl, Tipperary BURKE, Earl, Galway BURKE, MacDavid, " BURKE, Tipperary BURKE, Sligo BURKE, Kildare BURKE, Lord, Tiperrary BURKE, Viscount, Galway BURNELL, Dublin BUTLER, Baron, Meath BUTLER, Baron, Carlow BUTLER, Baron, Wicklow BUTLER, Baron, Tipperary BUTLER, Queen's Co BUTLER, Wexford BUTLER, Waterford BUTLER, Tipperary BUTLER, Earl Galway BUTLER, Viscount, Wexford BUTTER, Viscount, Kilkenny CANTWELL, Tipperary CAPEL, De, Cork CAPEL, Baron, Carlow CAREW, De, Cork CHEEVERS, Wicklow CHEVERS, Carlow CHEVERS, Meath CLARE, De, Earl,DECLARE Kilkenny CLARE, De, Clare CLINTON, Louth COGAN, De,DECOGAN Cork COGAN, De, Lord, " COKE, Carlow COLCLOUGH, Wexford COMERFORD, " COMERFORD, Kilkenny CONDON, Baron, Cork CONROY, Roscommon COPELAND, Down COPPINGER, Cork COURCY, De,DECOURCY Dublin COURCY, De, Earl, Down COURCY, De, Earl, Cork CREAGH, Clare CRUISE, Meath CRUISE, Dublin CUSACK, (O'CISOGHE) Meath CUSACK, " Clare CUSACK, " Mayo DALTON, Baron, Meath DALTON, Waterford DARCY, Meath DARCY, Galway DARDIS, Meath DEANE, Galway DEASE, Westmeath DELAHOYDE, Dublin DELAHOYDE, Kildare DEVEREUX, Monaghan DEVEREUS, Wexford DILLON, Baron, Galway DILLON, Baron, West Meath DILLON, Earl, Roscommon DILLON, Meath DOWDALL, Meath DRAKE, " ESMOND, Wexford EUSTACE, Carlow FAGAN, Dublin FAGAN, West Meath FITZ-EUSTACE, Baron, Meath FITZ-EUSTACE, Dublin FITZ-EUSTACE, Viscount, Wicklow FITZGERALD, Baron, Waterford FITZGERALD, Duke, Kildare FITZGERALD, " FITZGERALD, King's Co. FITZGERALD, Carlow FITZGERALD, Earl, Queen's Co. FITZGERALD, Earl, Cork FITZGERALD, Earl, Limerick FITZGERALD, Earl, Kerry FITZGERALD, Earl, Kildare FITZGERALD, Tipperary FITZGERALD, Wexford FITZGERALD, Knight, Limerick FITZGERALD, Knight, Kerry FITZGERALD, Lord, Limerick FITZGERALD, Lord, Wicklow FITZGERALD, Lord, Cork FITZGERALD, (or FITZGIBBON)(The White Knight) " FITZHARRIS, Wexford FITZHARRIS, Limerick FITZHENRY, Kildare FITZHENRY, Wexford FITZMAURICE, Earl, Kerry FITZPAtrICK, Cavan FITZPAtrICK,(orMAC-GILPAtrICK),Prince, Queen's Co. FITZSIMON, Down FITZSIMON, Cavan FITZSIMON, West Meath FITZSIMON, Dublin FITZSIMON, King's Co. FITZSTEPHEN, Wexford FITZWILLIAM, Viscount, Dublin FLEMING, Mayo FLEMING, Cavan FLEMING, Louth FLEMING, Baron, Meath FLEMING, Viscount, Longford FORD (orMacCONSNAVAL),Chief, Leitrim FRENCH, Wexford FRENCH, Galway FRENCH, Roscommon FURLONG, Wexford FURLONG, Wicklow GALWAY, Cork GENEVILLE, De, Lord Meath GERNON, De, Louth GOULD, Cork GRACE, Queen's Co. GRACE, Carlow GRACE, Tipperary GRACE, Lord, Kilkenny GUNNING, Limerick HAROLD, " HAY, Wexford HORE, " HUGHES, Monaghan HUGHES, Wicklow HUGHES,(or McHUGH), Galway HUSSEY, Kerry HUSSEY, King's Co. HUSSEY, Baron, Meath JORDAN, Down JOY, Kerry JOYCE, Chief, Galway JOYCE, Mayo KEATING, Wexford LACEY, De, West Meath LACEY, De, Meath LACEY, De, King's Co. LACEY, De, Earl, Down LACEY, De, Earl, Antrim LACEY, De, Lord, Limerick LAFFAN, Wexford LAMARE, De, West Meath LANGAN, Meath LAWLESS, Mayo LAURENCE, St., Baron, Dublin LOMBARD, Carlow LOMBARD, Carlow LYNCH, Galway MacALISTER, Antrim MacARDELL, Chief, Monaghan MacARTHUR, Limerick MacAULEY, Lord, West Meath MacAULIFFE, Chief, Cork MacAVEELY, Mayo MacBRADY, Chief, Cavan MacBREEN, Tyrone MacBREEN, Chief, Kilkenny MacBRENNAN, Chief, Roscommon MacBRIDE, Donegal Mac-I-BRIEN, Lord, Tipperary MacBRODIN, Clare MacCABE, Chief, Monaghan MacCABE, Chief, Cavan MacCAFFREY, Fermanagh MacCOGHWELL, Chief, Tyrone MacCANN, Louth MacCANN, Lord, Armagh MacCARTAN, Lord, Down MacCARTHY, King, Cork MacCARTHY, King, Tipperary MacCARTHY, Lord, Kerry MacCARTHY, Prince, Cork MacCARTHY MORE, Prince, Kerry MacCARTHY REAGH, Prince, Cork MacCASHIN, Queen's Co. MacCLANCY, Lord, Leitrim MacCLANCY (BREHON), Kerry MacCLANCY, Chief, Cork MacCLANCEY, Clare MacCLEAN, Donegal MacCLEAN, Antrim MacCLOSKEY, Donegal MacCLOSKEY, Chief, Derry MacCOGAN, Queen's Co. MacCOGGAN, Tipperary MacCOGHLAN, Lord, Queen's Co. MacCOLREAVY, " MacCONMEL, Tyrone MacCONNELL, " MacCONNELL, Derry MacCONRY, Chief, Galway MacCONSNAVA (or FORD),Chief, Leitrim MacCONWAY, Longford MacCONWAY, Sligo MacCORMAC, Tipperary MacCORMAC, Lord, Longford MacCOSKLEY, Tyrone MacCOSTELLO, Mayo MacCOURT, Tyrone MacCOURTY, Leitrim MacCRACKEN, Derry MacCREHAN, Kerry MacCROSSAN, Tyrone MacCROSSAN, Donegal MacDAVETT " MacDERMOTT, Prince, Roscommon MacDERMOTT, Prince, Sligo MacDONNELL, Chief, Clare MacDONNELL, Chief, Derry MacDONNELL, Chief, Queen's Co. MacDONNELL, Kildare MacDONNELL, Earl, Antrim MacDONOGH, Lord, Sligo MacDONOUGH, Lord, Cork MacDORCHY, Leitrim MacDOUGALL, Antrim MacDOWELL, Roscommon MacDUVAN, Chief, Donegal MacEGAN (BREHON), Kerry MacEGAN (BREHON), Tipperary MacEGAN (BREHON), Galway MacELLIGOT, Kerry MacENEIRY, Lord, Limerick MacENTEGGART, Fermanagh MacEVOY, Armagh MacEVOY, Chief, Queen's Co. MacEVOY, Lord, West Meath MacFERGUS, Leitrim MacFINEEN, Chief, Kerry MacFINNEVAR, Leitrim MacFIRBIS, Sligo MacGAFNEY, Cavan MacGARGAN, " MacGARRAHAN, Fermanagh MacGARRY, Mayo MacGAURAN, Lord, Cavan MacGAVAN, Longford MacGAVAN, Mayo MacGENNIS, Prince, Down MacGEOGHHEGAN, Lord, West Meath MacGEOGHHEGAN, Prince, " MacGERAGHTY, Sligo MacGEREAGHTY, Mayo MacGETTIGAN, Donegal MacGIBBON, Mayo MacGILBRIDE, Donegal MacGILCHRIST, Longford MacGILDAUFF, Galway MacGILFINNEN, Lord, Fermanagh MacGILFOYLE, Tipperary MacGILLICUDDY of the... Reeks, Chief, Kerry MacGILLIGAN, Derry MacGILLIGAN, Chief, Longford MacGILLIKELLY Galway MacGILMARTIN, Leitrim MacGILMICHAEL, Chief, Monaghan MacGILMORE, Down MacGILPAtrICK, Kilkenny MacGILROY, Monaghan MacGINTY, Donegal MacGIOLLAMOCHOLMOGE, Lord, Dublin MacGLOIN, Leitrim MacGOLRICK, Tyrone MacGORIGAL, Donegal MacGORMAN, Chief, Carlow MacGOWAN (or Smith), Chief, Cavan MacGOWAN, Leitrim MacGOWAN, Donegal MacGOWAN, Down MacGRANE, Meath MacGREAL, Mayo MacGUIRE, Prince, Fermanagh MacGULSHENAN, " MacHALE (or MacCAIL), Mayo MacHUGH, Chief, Galway MacHUGH (or HUGHES), " MacHUGH, Donegal MacHUGH, Cavan MacHUGH, Longford MacINTIRE, Donegal MacINTYRE, Chief, Tyrone MacJORDAN, de Exeter, Lord, Mayo MacKENNA, Lord, Monaghan MacKENNY, Leitrim MacKENNY, Louth MacKEOGH, Wexford MacKEOGH, Chief, Roscommon MacKEON, Leitrim MacKIERNAN, Lord, Cavan MacLENNON, Fermanagh MacLEONARD, Lord, " MacLOGHLIN, Prince Donegal MacLOUGHLIN, Derry MacLYSAGHT, Clare MacMAHON, Lord, " MacMAHON, Lord, Monaghan MacMAHON, Prince, " MacMANUS, Fermanagh MacMANUS, Roscommon MacMURROUGH, Carlow MacMURROUGH, King, Wexford MacMURROUGH, Prince, Wicklow MacNALLY, Antrim MacNALLY, Mayo MacNAMARA, Prince, Clare MacNAMEE, Derry MacNENEY, Monaghan MacNEVIN, Galway MacNULTY, Donegal MacNULTY, Cavan MacNULTY, Mayo MacORIAGHTY, Lord Roscommon MacOSCAR, Chief, Monaghan MacOWEN, Tyrone MacPARTLAN, Leitrim MacPHILLIPS, Mayo MacQUADE, Monaghan MacQUILLAN, Lord, Antrim MacRANNALL (or REYNOLDS), Lord, Leitrim MacRORY, Chief, Tyrone MacRORY, Chief, Down MacRUARC, West Meath MacSHANE, Chief, Tyrone MacSHANLEY, Chief, Leitrim MacSHEEHY, Limerick MacSHEEHY, Chief, Kerry MacSHEEHY, Chief, Cork MacSHERRY, " MacSMITH, Chief, Cavan MacSWEENEY, Chief, Cork MacSWEENY, Chief, Kerry MacSWEENY, Lord, Donegal McTAGGART, Tyrone MacTEIGE Donegal MacTEIGUE, Carlow MacTEIGUE, Leitrim MacTIERNAN, Fermanagh MacTIERNAN, Lord, Cavan MacTULLY, Fermanagh MacTULLY, Chief, Cavan MacTULLY, Galway MacWARD, Donegal MacWARD, Galway MAGINN, Londonderry MAGRATH, Waterford MAGRATH, Kerry MAGRATH, Clare MAGRATH, Tipperary MAGRATH, Fermanagh MAGUIRK, Tyrone MANDEVILLE, Down MARESCHAL, Le, Earl, Wexford MARESCHAL, Le, Earl, Kilkenny MARTELL, Down MARTIN, Galway MARWARD, Baron, Meath MASTERSON, Wexford MASTERSON, Cavan MEYLER, Wexford MISSETT, Baron, Meath MOCKLER, Tipperary MONTMORENCY, De, Wexford MONTMORENCY, De, Kilkenny MORGAN, Wexford MORRIS, Waterford MORRIS, Tipperary MORRIS, Galway MORTIMER, Lord Queen's Co. MORTIMER, De, Lord, Meath NAGLE, Cork NANGLE, Baron, Meath NANGLE, Mayo NETTERVILLE, Baron Meath NORTON (or O'NAGHTEN), Chief, Galway NUGENT, Baron, Meath NUGENT, West Meath O'AHERN, Cork O'BAIRE, Chief, Waterford O'BANNAN, Chief, King's Co O'BANNAN, Chief, Mayo O'BEGLEY, Donegal O'BEGLEY, Waterford O'BEHAN, Chief, King's Co O'BEIRNE, Chief, Roscommon O'BERGIN, King's Co O'BILLRY, Limerick O'BIRN, Mayo O'BLIGH, " O'BOLGER, Kilkenny O'BOYLAN, Chief, Monaghan O'BOYLE, Lord, Donegal O'BRADLEY, Cork O'BRANAGAN, Louth O'BREE, Kilkenny O'BRENNAN, Kerry O'BRENNAN, Lord, Kilkenny O'BRESLIN, Chief, Donegal O'BRESLIN (BREHON), Fermanagh O'BRESLIN, Chief, Tipperary O'BRIC, Lord, Waterford O'BRIEN, Baron, Clare O'BRIEN, Chief, Waterford O'BRIEN, King, Prince, and Earl, Clare O'BRIEN, King, Tipperary O'BRIEN, Lord, Galway O'BRIEN, Lord, Tipperary O'Brien, Lord, Limerick O'BRIEN, Prince, " O'BRIGAN, Cork O'BRODAR, Chief, Donegal O'BRODAR, Lord, Kilkenny O'BRODY, Mayo O'BROGAN, Cavan O'BROGAN, Sligo O'BROGAN, Mayo O'BROGAN, Queen's Co O'BROICHAN, Chief, Londonderry O'BROSNAGHAN, Kerry O'BYRNE, Lord, Wicklow O'CAHANEY, Chief, Mayo O'CAHILL, Chief, Carlow O'CAHILL, Chief, Tipperary O'CAHILL, Kerry O'CAHILL> Galway O'CALLAGHAN Chief, Tyrone O'MILFORD, Mayo O'MOGHAN, " O'MOLLOY, Prince, King's Co O'MOLONEY, Chief, Clare O'MONAHAN, Chief, Roscommon O'MONGAN, Sligo O'MOONEY, Chief, Queen's Co O'MOONEY, Chief, King's Co O'MOORE, Chief, Down O'MOORE, Prince, Queen's Co O'MOORE, Lord, Carlow O'MOORE, Kerry O'MORAN, Roscommon O'MORAN, Mayo O'MORAN, Galway O'MORAN, Down O'MORAN, Sligo O'MORIARITY, Chief, Kerry O'MORONY, Chief, Clare O'MORONY, Cork O'MORONY, Chief, Limerick O'MORRISSEY, Tipperary O'MORRISSEY, Sligo O'MORRISSON, " O'MORRISSON, Donegal O'MOYNAGH, Sligo O'MULCAHY, Chief, Tipperary O'MULCAHY, Limerick O'MULCLOHY, Lord, Sligo O'MULDOON, Chief, Fermanagh O'MULDORRY, Prince, Donegal O'MULFINNY, Longford O'MULGEE, Donegal O'MULHOLLAND, Antrim O'MULLALLY, Lord, Galway O'MULLANE, Waterford O'MULLANE, Chief, Kerry O'MULLANY, Waterford O'MULLARKY, Galway O'MULLEADY, West Meath O'MULLEENY, Mayo O'MULLEN, Chief Londonderry O'MULLIGAN, Cavan O'MULLIGAN, Londonderry O'MULLINS, Clare O'MOLLOY, Roscommon O'MULMOGHERY, Donegal O'MULRENIN, Mayo O'MULRENIN, Chief, Roscommon O'MULROONEY, Galway O'MULROONEY, Fermanagh O'MULROY, Mayo O'MULVANY, Sligo O'MULVANY, King's Co O'MULVANY, Donegal O'MULVEY, Chief, Leitrim O'MULVIHIL, Roscommon O'MUREADY, Chief, King's Co O'MURPHY, Lord, Wexford O'MURPHY, Cork O'MURRAY, Lord, Mayo O'MURRAY, Cavan O'MURRAY, Donegal O'MURRAY, Chief, Londonderry O'MURRIGAN, Prince, Kildare O'MUTAGH, Meath O'NAGHTEN (or NORTON), Chief, Galway O'NEIL (or NIHEL), Clare O'NEIL, Prince, Donegal O'NEIL, Lord, Antrim O'NEIL, Lord, Down O'NEIL, Lord, Armagh O'NEIL, King, Prince, Earl, Tyrone O'NENEY, Chief, " O'NENY, Monaghan O'NEYLAN, Chief, Armagh O'NEYLAN, Clare O'NOLAN, Lord, Carlow O'NOONAN, Chief, Cork O'NORTON, Chief, Roscommon O'QUIGLY, Londonderry O'QUILL, Kerry O'QUINLAN, Tipperary O'QUINLAN, Kerry O'QUINLEVAN, Clare O'QUINLEVAN, Chief, Tipperary O'QUINN, Chief, Donegal O'QUINN, Lord, Londonderry O'QUINN, Chief, Tyrone O'QUINN, Lord, Longford O'QUINN, Lord, Limerick O'QUINN, Lord, Clare O'QUINN, Mayo O'RAFFERTY, Donegal O'RAFFERTY, Tyrone O'REGAN, Chief, Queen's Co O'REGAN, Prince, Meath O'REGAN, Cork O'REILLY, Prince, Cavan O'REILLY, Chief, Meath O'REILLY, West Meath O'REILLY, Longford O'RIORDAN, Chief, Cork O'RODAGHAN, Chief, Leitrim O'RODDAN, Mayo O'RODDY, Donegal O'RODY, " O'ROGAN, Down O'RONAN, Longford O'RONAN, Mayo O'RONAYNE, Cork O'ROONEY, Down O'RORY, Prince, Meath O'ROTHLAN, Mayo O'ROURKE, Prince, Leitrim O'RYAN, Lord, Carlow O'RYAN, Kilkenny O'RYAN, Limerick O'RYAN, Lord, Tipperary O'SCANLAN, Chief, Louth O'SCANLAN, Kerry O'SCANLAN, Chief, Limerick O'SCANNELL, Cork O'SCULLAN, Derry O'SCULLY, Baron, Meath O'SCULLY, Tipperary O'SCURRY, Galway O'SEXTON, Tipperary O'SHANAHAN, " O'SHAUGHNESY, Lord, Galway O'SHEA, Cork O'SHEA, Lord, Kerry O'SHEA, Tipperary O'SHEA (or SHEE), Kilkenny O'SHEEHAN, Kerry O'SHEEHAN, Chief, Limerick O'SHEEHAN, Galway O'SHEEHAN, Donegal O'SHERIDAN, Cavan O'SHERIDAN, Longford O'SHIEL, Antrim O'SHIEL, Chief, West Meath O'SIONAGH, " O'SLATTERY, Kerry O'SLATTERY, Tipperary O'SLEVIN, Longford O'SPILLAN, Tipperary O'SPILLANE, Sligo O'SULLIVAN, Galway O'SULLIVAN, Lord, Tipperary O'SULLIVAN BEARE, Prince, Cork O'SULLIVAN, Prince, " O'SULLIVAN MORE, Lord, O'TALCHARAN, Mayo O'TARCERT, Chief, Donegal O'TEIGE, (or TIGHE), Wicklow O'TEIGUE, Tyrone O'TIERNEY, Armagh O'TIERNEY, Lord, Mayo O'TOLARG, Lord, West Meath O'TOMALTY, Tyrone O'TOOLE, Lord, Kildare O'TOOLE, Prince, Wicklow O'TOOLE, Galway O'TOOLE, Mayo O'TORMEY, Galway O'trACEY, " O'trACY, Fermanagh O'trAYNOR, Meath O'TULLY, Fermanagh O'TUOHY, Cork O'TUOMEY, " PEPPARD, Louth PETIT, Baron, West Meath PETIT, Mayo PHEPOE, Meath PLUNKET, Baron, Louth PLUNKETT, Cavan PLUNKETT, Earl, Meath PLUNKETT, Dublin POER, Le, Down POER, Le, Lord, Waterford POER, Le(or Power), " POWER, Kilkenny PRENDERGAST, Mayo PRENDERGAST, De Wexford PRESTON, Viscount, Dublin PURCELL, Kilkenny PURCELL, Limerick PURCELL, Baron, Tipperary QUIGLEY (see O'COIGLEY) REDMOND, Wexford RENZY, De, " RIDDELL, Down ROCHE, Viscount Cork ROCHE, ROACHEROACH Limerick, WexfordKillkenny, Tipperary ROSSITER, Wexford ROTH, Kilkenny RUSSELL, Down RUSSELL, Limerick SARSFIELD, Earl, Dublin SARSFIELD, Carlow SARSFIELD, Cork SARSFIELD, Viscount, Limerick SAVADGE, Lord, Down SEAGRAVE, Dublin SINNOTT, Wexford SHERLOCK, Waterford SHORTALL, Kilkenny SKERRET, Galway SKIDDY, Cork SMERWICK, Kerry SMYTH, Down STACK, Kerry STAFFORD, Wexford STAUNTON, Down STAUNTON, Galway STAUNTON, Mayo StrONGBOW, Carlow StrONGBOW, Earl, Wexford SUPPLE, Cork SUTTON, Wexford SYNOTT, Mayo TAAFE, Earl, Louth TAAFE, Baron, Mayo TAAFE, Baron, Dublin TALBOT, Wicklow TALBOT, Earl, Wexford TALBOT, Waterford TALLON, Carlow TAYLOR, Dublin trANT, Kerry trOY, Limerick TUITE, Baron, West Meath TUITE, Longford TYRRELL, West Meath TYRRELL, Baron, Dublin VERDON, De, Louth VERDON, De, West Meath VESEY, De, Lord, Kildare VESEY, De, Lord, Queen's Co WADDING, Waterford WADDING, Wexford WALL, Carlow WALL, Waterford WALSH, Dublin WALSH, Wicklow WALSH, Wexford WALSH, West Meath WALSH, Waterford WALSH, Cork WALSH, Kerry WALSH, Tipperary WARREN, King's Co WHITE, Down WHITE, Waterford WHITE, Limerick WHITE, Tipperary WOGAN, Kildare WOULFE, Limerick WYSE, Waterford Source: "Irish Pedigrees" by John O'Hart, vol. 2.