Variant spellings are included, so there may be some duplication. If you know of something that should be included, please let me know
| Cadam Derry/New Zealand |
| Cadam Co. Monaghan |
| Caddam Derry/New Zealand |
| Caddam Co. Monaghan |
| Cagney Rathkeale |
| Cahill |
| Cain (archived) |
| Cain New Zealand (archived) |
| Cain N.W. Pennsylvania (archived) |
| Caine (archived) |
| Caine New Zealand (archived) |
| Caine N.W. Pennsylvania (archived) |
| Calaghan (archived) |
| Calaghan (archived) |
| Calaghan |
| Calahan (archived) |
| Calahan (archived) |
| Calahan |
| Calaher |
| Calally (archived) |
| Calbert |
| Callagan (archived) |
| Callagan (archived) |
| Callagan |
| Callaghan (archived) |
| Callaghan (archived) |
| Callaghan |
| Callaghane (archived) |
| Callaghane (archived) |
| Callaghane |
| Callagher |
| Callahan (archived) |
| Callahan (archived) |
| Callahan |
| Callahane (archived) |
| Callahane (archived) |
| Callahane |
| Callally (archived) |
| Callaly (archived) |
| Callan Monaghan/ Dakota county, Minn |
| Callan Co. Louth |
| Callan Dundalk |
| Callelly (archived) |
| Callely Callely (archived) |
| Callen Monaghan/ Dakota county, Minn |
| Callen Co. Louth |
| Callen Dundalk |
| Calligan (archived) |
| Calligan (archived) |
| Calligan |
| Callily (archived) |
| Callin Monaghan/ Dakota county, Minn |
| Callin Co. Louth |
| Callin Dundalk |
| Callister Co. Down |
| Callon Monaghan/ Dakota county, Minn |
| Callon Co. Louth |
| Callon Dundalk |
| Calpin |
| Calvert |
| Cane (archived) |
| Cane New Zealand (archived) |
| Cane N.W. Pennsylvania (archived) |
| Canney |
| Canny |
| Canulty Lancashire |
| Caomhánach (archived) |
| Caomhánach |
| Caples |
| Caplice |
| Capples |
| Capplis |
| Caragher |
| Caraher |
| Caran |
| Cardiff |
| Cardiffe |
| Carey Galway (archived) |
| Carey Soloheadbeg, Tipperary |
| Carlis Roscommon |
| Carlis |
| Carlos Roscommon |
| Carlos |
| Carmichael (archived) |
| Carnaghan |
| Carnahan |
| Carney Co. Cavan |
| Carney |
| Carney Michigan |
| Carny Co. Cavan |
| Carny |
| Carny Michigan |
| Caron |
| Carr Tyrone |
| Carr |
| Carragher |
| Carraher |
| Carraig |
| Carran |
| Carrane |
| Carre Tyrone |
| Carre |
| Carreg |
| Carren |
| Carrick |
| Carrig |
| Carrige |
| Carrigee |
| Carrigg |
| Carrigy |
| Carrol |
| Carrol |
| Carrol |
| Carrol |
| Carrol |
| Carrol |
| Carroll |
| Carroll |
| Carroll |
| Carroll |
| Carroll |
| Carroll |
| Carron |
| Carrún |
| Cartan |
| Cartan |
| Carten |
| Carten |
| Carthy |
| Carthy (archived) |
| Carthy (archived) |
| Carthy Kerry (archived) |
| Carthy |
| Carthy |
| Carthy |
| Carthy |
| Carthy |
| Cartin |
| Cartin |
| Carton |
| Carton |
| Carty |
| Carty (archived) |
| Carty (archived) |
| Carty Kerry (archived) |
| Carty |
| Carty |
| Carty |
| Carty |
| Carty |
| Cary Galway (archived) |
| Cary Soloheadbeg, Tipperary |
| Casady |
| Casady |
| Casady |
| Casey Dakota county, Minn |
| Casey Co. Clare |
| Casey (archived) |
| Casey |
| Casey Tipperary/ Australia |
| Cashen |
| Cashen Tipperary/ Tasmania |
| Casheon |
| Casheon Tipperary/ Tasmania |
| Cashin |
| Cashin Tipperary/ Tasmania |
| Cashman |
| Cashon |
| Cashon Tipperary/ Tasmania |
| Cassan |
| Cassan Antrim/ New Zealand |
| Cassedy |
| Cassedy |
| Cassedy |
| Cassel |
| Cassell |
| Cassells |
| Cassels |
| Cassen |
| Cassen Antrim/ New Zealand |
| Cassidy |
| Cassidy |
| Cassidy |
| Cassill |
| Cassils |
| Cassin |
| Cassin Antrim/ New Zealand |
| Cassion |
| Cassion Tipperary/ Tasmania |
| Casson |
| Casson Antrim/ New Zealand |
| Castle |
| Castles |
| Casy Dakota county, Minn |
| Casy Co. Clare |
| Casy (archived) |
| Casy |
| Casy Tipperary/ Australia |
| Caughlin |
| Cauley Derry/ Scotland/ Illinois |
| Cauley Donegal (archived) |
| Caully Derry/ Scotland/ Illinois |
| Caully Donegal (archived) |
| Cauly Derry/ Scotland/ Illinois |
| Cauly Donegal (archived) |
| Cavanagh (archived) |
| Cavanagh |
| Cavanaugh (archived) |
| Cavanaugh |
| Cavenagh (archived) |
| Cavenagh |
| Cawley Derry/ Scotland/ Illinois |
| Cawley Donegal (archived) |
| Cawly Derry/ Scotland/ Illinois |
| Cawly Donegal (archived) |
| Céitinn Wexford |
| Chalmers Scotland & Cork |
| Chesney |
| Chesnut Ballymoney, Co. Antrim |
| Chestnut Ballymoney, Co. Antrim |
| Chestnutt Ballymoney, Co. Antrim |
| Christian (archived) |
| Christopher |
| Cinnsealach (archived) |
| Cinnsealach |
| Claffey |
| Claffy |
| Clampet |
| Clampett |
| Clampit |
| Clarey |
| Clarey Australia (archived) |
| Clarey U.S. |
| Clark Laois/Canada |
| Clark Co. Meath, NY |
| Clarke Laois/Canada |
| Clarke Co. Meath, NY |
| Clary |
| Clary Australia (archived) |
| Clary U.S. |
| Cleary |
| Cleary Australia (archived) |
| Cleary U.S. |
| Cleery |
| Cleery Australia (archived) |
| Cleery U.S. |
| Cleland |
| Clelland |
| Clerihan |
| Clerihan |
| Clerk Laois/Canada |
| Clerk Co. Meath, NY |
| Clerkan |
| Clerkan |
| Clerke Laois/Canada |
| Clerke Co. Meath, NY |
| Clerken |
| Clerken |
| Clerkin |
| Clerkin |
| Clery |
| Clery Australia (archived) |
| Clery U.S. |
| Cloffey |
| Clogharty |
| Clogherty |
| Cloherty |
| Close Banbridge/Canada |
| Closkey Co. Cavan |
| Cluskey Co. Cavan |
| Clusky Co. Cavan |
| Coad |
| Coade |
| Coady |
| Coalter Ireland/Scotland (archived) |
| Coalter Tyrone/ S. Carolina |
| Coburn Louth |
| Coburne Louth |
| Cochlan |
| Cochran Donegal |
| Cochrane Donegal |
| Cockburn Louth |
| Cockburne Louth |
| Cocklin |
| Cody |
| Cofey |
| Cofey (archived) |
| Cofey Bandon, Co. Cork (archived) |
| Cofey |
| Coffee |
| Coffee (archived) |
| Coffee Bandon, Co. Cork (archived) |
| Coffee |
| Coffeen |
| Coffey |
| Coffey (archived) |
| Coffey Bandon, Co. Cork (archived) |
| Coffey |
| Coffy |
| Coffy (archived) |
| Coffy Bandon, Co. Cork (archived) |
| Coffy |
| Coghlan |
| Coghlin |
| Coghran Donegal |
| Coghrane Donegal |
| Coglane |
| Coglin |
| Coil Co. Cavan |
| Coil |
| Colbard |
| Colbert |
| Colburt |
| Colcloch |
| Colclough |
| Colebert |
| Coleburt |
| Colter Ireland/Scotland (archived) |
| Colter Tyrone/ S. Carolina |
| Conally Connollyweb (archived) |
| Conally Tuam (archived) |
| Conally Co. Monaghan (archived) |
| Conally Waterford & Pennsylvania (archived) |
| Conally |
| Conally |
| Conally |
| Conama |
| Conama (archived) |
| Conden Co. Cork (archived) |
| Condin Co. Cork (archived) |
| Condon Co. Cork (archived) |
| Congdon Co. Cork (archived) |
| Conmee |
| Conmee (archived) |
| Conmey |
| Conmey (archived) |
| Conmy |
| Conmy (archived) |
| Connair |
| Connair |
| Connair Prince Edward Island |
| Connair (archived) |
| Connair (archived) |
| Connair Nova Scotia (archived) |
| Connair DNA project: also (O')Connor/ Connors |
| Connair |
| Connair |
| Connair Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Connall |
| Connally Connollyweb (archived) |
| Connally Tuam (archived) |
| Connally Co. Monaghan (archived) |
| Connally Waterford & Pennsylvania (archived) |
| Connally |
| Connally |
| Connally |
| Connare |
| Connare |
| Connare Prince Edward Island |
| Connare (archived) |
| Connare (archived) |
| Connare Nova Scotia (archived) |
| Connare DNA project: also (O')Connor/ Connors |
| Connare |
| Connare |
| Connare Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Connel |
| Connell |
| Connelly Connollyweb (archived) |
| Connelly Tuam (archived) |
| Connelly Co. Monaghan (archived) |
| Connelly Waterford & Pennsylvania (archived) |
| Connelly |
| Connelly |
| Connelly |
| Conner |
| Conner |
| Conner Prince Edward Island |
| Conner (archived) |
| Conner (archived) |
| Conner Nova Scotia (archived) |
| Conner DNA project: also (O')Connor/ Connors |
| Conner |
| Conner |
| Conner Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Conners |
| Conners |
| Conners Prince Edward Island |
| Conners (archived) |
| Conners (archived) |
| Conners Nova Scotia (archived) |
| Conners DNA project: also (O')Connor/ Connors |
| Conners |
| Conners |
| Conners Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Connolly Connollyweb (archived) |
| Connolly Tuam (archived) |
| Connolly Co. Monaghan (archived) |
| Connolly Waterford & Pennsylvania (archived) |
| Connolly |
| Connolly |
| Connolly |
| Connoly Connollyweb (archived) |
| Connoly Tuam (archived) |
| Connoly Co. Monaghan (archived) |
| Connoly Waterford & Pennsylvania (archived) |
| Connoly |
| Connoly |
| Connoly |
| Connor |
| Connor |
| Connor Prince Edward Island |
| Connor (archived) |
| Connor (archived) |
| Connor Nova Scotia (archived) |
| Connor DNA project: also (O')Connor/ Connors |
| Connor |
| Connor |
| Connor Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Connors |
| Connors |
| Connors Prince Edward Island |
| Connors (archived) |
| Connors (archived) |
| Connors Nova Scotia (archived) |
| Connors DNA project: also (O')Connor/ Connors |
| Connors |
| Connors |
| Connors Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Conolly Connollyweb (archived) |
| Conolly Tuam (archived) |
| Conolly Co. Monaghan (archived) |
| Conolly Waterford & Pennsylvania (archived) |
| Conolly |
| Conolly |
| Conolly |
| Conomy |
| Conomy (archived) |
| Conor |
| Conor |
| Conor Prince Edward Island |
| Conor (archived) |
| Conor (archived) |
| Conor Nova Scotia (archived) |
| Conor DNA project: also (O')Connor/ Connors |
| Conor |
| Conor |
| Conor Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Conra |
| Conroy |
| Conry |
| Convey (archived) |
| Convill (archived) |
| Conville (archived) |
| Convy (archived) |
| Conway (archived) |
| Conyngham |
| Conyngham |
| Conyngham Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Coody |
| Coogan Co. Monaghan |
| Cooney Cavan |
| Cooney Wexford |
| Coony Cavan |
| Coony Wexford |
| Cooper |
| Copeland (archived) |
| Copinger |
| Copland (archived) |
| Coppinger |
| Corbet Newfoundland |
| Corbet Tuam (archived) |
| Corbet Waterford/ New Zealand |
| Corbett Newfoundland |
| Corbett Tuam (archived) |
| Corbett Waterford/ New Zealand |
| Corbit Newfoundland |
| Corbit Tuam (archived) |
| Corbit Waterford/ New Zealand |
| Corbitt Newfoundland |
| Corbitt Tuam (archived) |
| Corbitt Waterford/ New Zealand |
| Cormac |
| Cormac |
| Cormac |
| Cormac Westmeath |
| Cormac |
| Cormack |
| Cormack |
| Cormack |
| Cormack Westmeath |
| Cormack |
| Cormackan |
| Cormakan |
| Cormican |
| Cormick |
| Cormick |
| Cormick |
| Cormick Westmeath |
| Cormick |
| Cormickan |
| Corra Armagh, Down |
| Corrick |
| Costello Kerry; Archived |
| Costelloe Kerry; Archived |
| Costigan |
| Costigan Tipperary/Newfoundland |
| Coughlan |
| Coughlin |
| Coughran Donegal |
| Coulter Ireland/Scotland (archived) |
| Coulter Tyrone/ S. Carolina |
| Courtenay Armagh |
| Courtenay |
| Courtenay |
| Courteney Armagh |
| Courteney |
| Courteney |
| Courtnay Armagh |
| Courtnay |
| Courtnay |
| Courtney Armagh |
| Courtney |
| Courtney |
| Cousens |
| Cousin |
| Cousins |
| Couzins |
| Cowan (archived) |
| Cowen (archived) |
| Cowhen (archived) |
| Cowper |
| Cox |
| Cox Co. Offaly (King's) |
| Coxe |
| Coxe Co. Offaly (King's) |
| Coyle Co. Cavan |
| Coyle |
| Coyles Co. Cavan |
| Coyles |
| Cozens |
| Craig |
| Craige |
| Craigue |
| Crain |
| Craine |
| Crane |
| Cranson |
| Cranston |
| Crawford Donegal |
| Creagan |
| Creaghan |
| Creaghane |
| Cree One-name study |
| Creegan |
| Cregan |
| Creig |
| Creighan |
| Crien |
| Crine |
| Crines |
| Croaker Cork, Limerick, Dublin |
| Croker Cork, Limerick, Dublin |
| Croley |
| Croly |
| Cromlish Donegal |
| Cronan Cork. |
| Croneen Cork. |
| Cronin Cork. |
| Cronyn Cork. |
| Crossan Cavan |
| Crossen Cavan |
| Crossin Cavan |
| Crosson Cavan |
| Crowley |
| Crowly |
| Crumlish Donegal |
| Cryan |
| Cryne |
| Cue Tuam (archived) |
| Cuffey |
| Cuffey (archived) |
| Cuffey Bandon, Co. Cork (archived) |
| Cuffey |
| Cuilinane |
| Cuilinane |
| Culinan |
| Culinan |
| Cullagh |
| Cullan Carlow |
| Cullan Co. Leitrim |
| Cullanan |
| Cullanan |
| Cullane Carlow |
| Cullane Co. Leitrim |
| Cullen Carlow |
| Cullen Co. Leitrim |
| Cullenan |
| Cullenan |
| Cullens Carlow |
| Cullens Co. Leitrim |
| Cullin Carlow |
| Cullin Co. Leitrim |
| Cullinan |
| Cullinan |
| Cullinane |
| Cullinane |
| Cullnan |
| Cullnan |
| Culnane |
| Culnane |
| Cunnigham |
| Cunnigham |
| Cunnigham Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Cunningham |
| Cunningham |
| Cunningham Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Cunninghame |
| Cunninghame |
| Cunninghame Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Cunnungham |
| Cunnungham |
| Cunnungham Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Cunnyngham |
| Cunnyngham |
| Cunnyngham Kilbaha, Moyvane (Newtownsandes), Co. Kerry |
| Currie Armagh, Down |
| Currig |
| Curry Armagh, Down |
| Curtagne Co. Clare |
| Curtagne |
| Curtain Co. Clare |