- Name - CACANISIUS
Meaning - SON OF NIS
- Name - CACE
Meaning - VIGOROUS OR BRAVE
- Name - CACEY
Meaning - VIGOROUS OR BRAVE
- Name - CADHLA
Meaning - ATTRACTIVE
- Name - CADHLA
Meaning - HANDSOME
- Name - CAFFAR
Meaning - HELMET
- Name - CAGNEY
Meaning - SURNAME
- Name - CAHIR
Meaning - WAMOR
- Name - CAIN
Meaning - ARCHAIC
- Name - CAISEAL
Meaning - FROM CASHEL
- Name - CAITH
Meaning - FROM THE BATTLEFIELD
- Name - CALBHACH
Meaning - BALD
- Name - CALEY
Meaning - SLENDER
- Name - CALLAGHAN
Meaning - STRIFE
- Name - CALLAHAN
Meaning - SURNAME
- Name - CALLOUGH
Meaning - BALD
- Name - CALVAGH
Meaning - BALD
- Name - CALY
Meaning - SLENDER
- Name - CANICE
Meaning - HANDSOME
- Name - CAOLAIDHE
Meaning - SLENDER
- Name - CAOLAN
Meaning - SLENDER
- Name - CAOMH
Meaning - LOVABLE
- Name - CAREY
Meaning - OF THE DARK ONES
- Name - CARLIN
Meaning - LITTLE CHAMPION
- Name - CARNEY
Meaning - VICTORIOUS
- Name - CARRAIG
Meaning - ROCKY HEADLAND
- Name - CARRICK
Meaning - ROCKY HEADLAND
- Name - CARROLL
Meaning - CHAMPION
- Name - CARROLL
Meaning - MANLY
- Name - CARTHACH
Meaning - LOVING
- Name - CARTHAGE
Meaning - LOVING
- Name - CARY
Meaning - OF THE DARK ONES
- Name - CASE
Meaning - BRAVE
- Name - CASEY
Meaning - BRAVE
- Name - CASEY
Meaning - ALERT
- Name - CASHEL
Meaning - FROM CASHEL
- Name - CASS
Meaning - CURLY-HEADED
- Name - CASSIAN
Meaning - CURLY-HEADED
- Name - CASSIDY
Meaning - CURLY-HEADED
- Name - CATHAL
Meaning - BATTLE STRONG
- Name - CATHAOIR
Meaning - WARRIOR
- Name - CATHAOIR
Meaning - WAMOR
- Name - CATHMOR
Meaning - GREAT FIGHTER
- Name - CATHMORE
Meaning - GREAT FIGHTER
- Name - CAVAN
Meaning - FROM CAVAN
- Name - CAVAN
Meaning - HANDSOME
- Name - CEALLACH
Meaning - STRIFE
- Name - CEALLACHAN
Meaning - STRIFE
- Name - CEARBHALL
Meaning - MANLY
- Name - CEARNACH
Meaning - VICTORIOUS
- Name - CEIN
Meaning - ARCHAIC
- Name - CELSUS
Meaning - NAME OF A SAINT
- Name - CHANN
Meaning - YOUNG WOLF
- Name - CHANNE
Meaning - YOUNG WOLF
- Name - CHANNING
Meaning - YOUNG WOLF
- Name - CHANNON
Meaning - YOUNG WOLF
- Name - CIAN
Meaning - ANCIENT
- Name - CIAN
Meaning - ARCHAIC
- Name - CIANAN
Meaning - ANCIENT
- Name - CIANAN
Meaning - ARCHAIC
- Name - CIARRAI
Meaning - COUNTY
- Name - CIARRAI
Meaning - BLACK
- Name - CILLIAN
Meaning - BATTLE
- Name - CINNEIDE
Meaning - HELMETED
- Name - CLANCY
Meaning - RUDDY WARRIOR
- Name - CLEARY
Meaning - LEARNED
- Name - CLUNY
Meaning - FROM THE MEADOW
- Name - COCHLAIN
Meaning - HOODED
- Name - CODELL
Meaning - HELPFUL
- Name - CODEY
Meaning - HELPFUL
- Name - CODIE
Meaning - HELPFUL
- Name - CODY
Meaning - HELPFUL
- Name - COGHLAN
Meaning - HOODED
- Name - COILIN
Meaning - VIRILE
- Name - COINNEACH
Meaning - HANDSOME
- Name - COIREAIL
Meaning - LORDLY
- Name - COLEMAN
Meaning - DOVE
- Name - COLLA
Meaning - UNKNOWN
- Name - COLLIN
Meaning - VIRILE
- Name - COLLINS
Meaning - HOLLY
- Name - COLM
Meaning - DOVE
- Name - COLMAN
Meaning - DOVE
- Name - COLMCILLE
Meaning - DOVE OF THE CHURCH
- Name - COLUMBO
Meaning - DOVE
- Name - COMAN
Meaning - BENT
- Name - COMHGHAN
Meaning - TWIN
- Name - COMYN
Meaning - SHREWD
- Name - COMYN
Meaning - BENT
- Name - CONAIRE
Meaning - WISE OR RED
- Name - CONAL
Meaning - HIGH AND MIGHTY
- Name - CONAL
Meaning - HIGH
- Name - CONALL
Meaning - HIGH AND MIGHTY
- Name - CONALL
Meaning - HIGH
- Name - CONAN
Meaning - EXALTED
- Name - CONAN
Meaning - HOUND
- Name - CONARY
Meaning - EXALTED
- Name - CONLAN
Meaning - HERO
- Name - CONLETH
Meaning - ARDENT OR WISE
- Name - CONLEY
Meaning - ARDENT OR WISE
- Name - CONN
Meaning - HIGH OR MIGHTY
- Name - CONN
Meaning - HIGH
- Name - CONNACHT
Meaning - BRAVE OR WISE
- Name - CONNAL
Meaning - HIGH
- Name - CONNELL
Meaning - SURNAME
- Name - CONNER
Meaning - HOUND-LOVER
- Name - CONNER
Meaning - EXALTED
- Name - CONNLAIO
Meaning - ARDENT OR WISE
- Name - CONNOLLY
Meaning - BRAVE OR WISE
- Name - CONNOR
Meaning - EXALTED
- Name - CONNY
Meaning - EXALTED
- Name - CONOR
Meaning - EXALTED
- Name - CONROY
Meaning - WISE OR RED
- Name - CONROY
Meaning - WISE
- Name - CONWAY
Meaning - HOUND OF THE PLAIN
- Name - COOEY
Meaning - HOUND OF THE PLAINS
- Name - COOEY
Meaning - HOUND OF THE PLAIN
- Name - COOLEY
Meaning - HOUND OF ULSTER
- Name - COOLIE
Meaning - HOUND OF ULSTER
- Name - COONEY
Meaning - HANDSOME
- Name - CORBMAC
Meaning - CHARIOTEER
- Name - CORCORAN
Meaning - REDDISH SKIN SURNAME
- Name - CORCORAN
Meaning - RUDDY
- Name - CORI
Meaning - FROM THE ROUND HILL
- Name - CORIN
Meaning - SPEAR-BEARER
- Name - CORLAN
Meaning - SPEAR-BEARER
- Name - CORMAC
Meaning - RAVEN'S SON
- Name - CORMAC
Meaning - CHARIOTEER
- Name - CORMACK
Meaning - RAVEN'S SON
- Name - CORMIC
Meaning - RAVEN'S SON
- Name - CORMIC
Meaning - CHARIOTEER
- Name - CORMICK
Meaning - RAVEN'S SON
- Name - CORMICK
Meaning - CHARIOTEER
- Name - CORRAN
Meaning - SPEAR BEARER
- Name - CORRAN
Meaning - SPEAR-BEARER
- Name - CORREN
Meaning - SPEAR BEARER
- Name - CORREN
Meaning - SPEAR-BEARER
- Name - CORRICK
Meaning - FROM THE RAVINE
- Name - CORRIGAN
Meaning - SPEAR BEARER
- Name - CORRIN
Meaning - SPEAR BEARER
- Name - CORRIN
Meaning - SPEAR-BEARER
- Name - CORY
Meaning - FROM THE ROUND HILL
- Name - COSGROVE
Meaning - CHAMPION
- Name - COSTELLO
Meaning - SURNAME
- Name - COUGHLAN
Meaning - HOODED
- Name - COWAN
Meaning - HILLSIDE HOLLOW
- Name - COWAN
Meaning - TWIN
- Name - COWEN
Meaning - HILLSIDE HOLLOW
- Name - COWEN
Meaning - TWIN
- Name - COWYN
Meaning - HILLSIDE HOLLOW
- Name - COWYN
Meaning - TWIN
- Name - COYLE
Meaning - LEADER IN BATTLE
- Name - CREVAN
Meaning - FOX
- Name - CROGHER
Meaning - LOVES HOUNDS
- Name - CROHOORE
Meaning - LOVES HOUNDS
- Name - CRONAN
Meaning - LITTLE DARK ONE
- Name - CROWLEY
Meaning - HUNCH BACKED
- Name - CRUADHLAOICH
Meaning - HUNCH BACKED
- Name - CUANAIC
Meaning - HANDSOME
- Name - CUINN
Meaning - INTELLIGENT
- Name - CULLAN
Meaning - GOOD-LOOKING LAD
- Name - CULLAN
Meaning - HANDSOME
- Name - CULLEN
Meaning - GOOD-LOOKING LAD
- Name - CULLEN
Meaning - HANDSOME
- Name - CULLIN
Meaning - GOOD-LOOKING LAD
- Name - CULLIN
Meaning - HANDSOME
- Name - CULLO
Meaning - HOUND OF ULSTER
- Name - CUMHEA
Meaning - HOUND OF THE PLAINS
- Name - CURRAN
Meaning - SURNAME
- Name - CURRAN
Meaning - HERO
- Name - CUULADH
Meaning - HOUND OF ULSTER
- Name - CUYLER
Meaning - CHAPEL
