- Name - CADELL
Meaning - WARRING
- Name - CADMAN
Meaning - FIGHTER
- Name - CAEDMON
Meaning - WISE WARRIOR
- Name - CAEL
Meaning - VICTORIOUS PEOPLE
- Name - CAHAL
Meaning - STRONG IN BATTLE
- Name - CAIRBRE
Meaning - CHARIOTEER
- Name - CAIRBRE
Meaning - STRONG MAN
- Name - CALDER
Meaning - FROM THE STONY RIVER
- Name - CALLUM
Meaning - DOVE
- Name - CALUM
Meaning - DOVE
- Name - CAMERO
Meaning - CROOKED NOSE
- Name - CAMERON
Meaning - CROOKED NOSE
- Name - CAMEY
Meaning - CROOKED NOSE
- Name - CAMLIN
Meaning - CROOKED LINE
- Name - CAOIMHGHIN
Meaning - GENTLE
- Name - CAR
Meaning - FIGHTER
- Name - CARADOC
Meaning - DEARLY LOVED
- Name - CARBRY
Meaning - CHARIOTEER
- Name - CARDEW
Meaning - FROM THE BLACK FORT
- Name - CAREW
Meaning - FROM THE FORTRESS
- Name - CAREY
Meaning - FROM THE FORTRESS
- Name - CARGAN
Meaning - LITTLE ROCK
- Name - CARLOW
Meaning - QUADRUPLE LAKE
- Name - CARNEY
Meaning - FIGHTER
- Name - CARR
Meaning - FIGHTER
- Name - CARROL
Meaning - CHAMPION
- Name - CARROLL
Meaning - CHAMPION
- Name - CARY
Meaning - FROM THE FORTRESS
- Name - CASEY
Meaning - BRAVE
- Name - CASSIVELLAUNUS
Meaning - FROM ARTHURIAN LEGEND
- Name - CASWALLAN
Meaning - FROM ARTHURIAN LEGEND
- Name - CATHAIR
Meaning - FIGHTER
- Name - CATHAL
Meaning - STRONG IN BATTLE
- Name - CATHAL
Meaning - MIGHTY BATTLE
- Name - CATHAOIR
Meaning - FIGHTER
- Name - CEALLACH
Meaning - LITTLE KELLY - STRIFE
- Name - CEDRIC
Meaning - CBIEF
- Name - CHAD
Meaning - DEFENCE
- Name - CIAN
Meaning - ANCIENT
- Name - CILLIAN
Meaning - WAR
- Name - COALAN
Meaning - SLENDER
- Name - COCIDIUS
Meaning - MYTHICAL HUNTER GOD
- Name - COINNEACH
Meaning - HANDSOME
- Name - COLIN
Meaning - YOUTH
- Name - COLM
Meaning - DOVE
- Name - COLUM
Meaning - DOVE
- Name - CON
Meaning - WISE
- Name - CONAL
Meaning - HIGH
- Name - CONALL
Meaning - STRONG IN BATTLE HIGH
- Name - CONAN
Meaning - WISE
- Name - CONANT
Meaning - WISE
- Name - CONCHOBAR
Meaning - MYTHICAL HERO
- Name - CONDAN
Meaning - DARK HAIRED WISE MAN
- Name - CONDON
Meaning - DARK HAIRED WISE MAN
- Name - CONLAN
Meaning - HERO
- Name - CONLEY
Meaning - HERO
- Name - CONNAL
Meaning - HIGH
- Name - CONNELL
Meaning - STRONG IN BATTLE
- Name - CONNER
Meaning - DESIRE
- Name - CONNLA
Meaning - MYTHICAL SON OF CONN
- Name - CONNLEY
Meaning - HERO
- Name - CONNOR
Meaning - MUCH WANTED
- Name - CONOR
Meaning - MUCH WANTED
- Name - CONROY
Meaning - PERSISTENT
- Name - CONROY
Meaning - WISE MAN
- Name - CONWAY
Meaning - HOUND OF THE PLAIN
- Name - CORANN
Meaning - MYTHICAL DRUID
- Name - COREY
Meaning - RAVEN
- Name - CORMAC
Meaning - CHARIOTEER
- Name - CRADAWG
Meaning - MYTHICAL SON OF BRAN
- Name - CRAIG
Meaning - FROM NEAR THE CRAG
- Name - CREVAN
Meaning - FOX
- Name - CUINN
Meaning - WISE
- Name - CULAIN
Meaning - MYTHICAL SMITH
- Name - CULANN
Meaning - MYTHICAL SMITH
- Name - CULLEN
Meaning - YOUNG ANIMAL
- Name - CULLEN
Meaning - CUB
- Name - CURRY
Meaning - A MARSH OR AN HERB
- Name - CUSTENNIN
Meaning - MYTHICAL GIANT
