- Caddy
- Cadel
- Caden
- Cadfael
- Cadwallader
- Cahil
- Cain
- Caiseal
- Caius
- Cal
- Calder
- Caleb
- Callen
- Callum
- Calo
- Calum
- Calut
- Calv
- Calvin
- Cam
- Camerino
- Cameron
- Camlo
- Can
- Canute
- Cappi
- Carel
- Carew
- Carey
- Carl
- Carle
- Carleton
- Carlo
- Carlos
- Carlton
- Carlucho
- Carmine
- Carmit
- Carson
- Carswell
- Carter
- Carvel
- Cary
- Carter
- Casey
- Cashel
- Casimir
- Caspar
- Casper
- Cass
- Cassidy
- Castel
- Castor
- Catalin
- Cathal
- Cathol
- Canton
- Cebastian
- Cecil
- Cedric
- Celyn
- Ceslovas
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- Cemal
- Cesar
- Chad
- Chaim
- Chaiwat
- Chal
- Chandler
- Chane
- Chaney
- Charlemagne
- Charles
- Charley
- Charlton
- Chase
- Chaseston
- Chaudry
- Chauncey
- Chauncy
- Chauvin
- Chay
- Chaz
- Che
- Chen
- Cheslav
- Chesmu
- Chester
- Chet
- Cheyne
- Chi
- Chiah
- Chico
- Chik
- Chioke
- Chip
- Chou
- Chretien
- Chris
- Christ
- Christao
- Christian
- Christmas
- Christoph
- Christophe
- Christopher
- Chuck
- Chucky
- Chun
- Chung
- Church
- Cicero
- Cid
- Cirill
- Cisco
- Cladio
- Clarence
- Clark
- Clarke
- Claud
- Claude
- Claudio
- Claudius
- Claus
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- Clay
- Clayton
- Cleanth
- Clem
- Clemens
- Clement
- Clemente
- Clerk
- Cleveland
- Clevonne
- Cliff
- Clifford
- Cliffy
- Clint
- Clinton
- Clive
- Clyde
- Cnut
- Coinneach
- Colby
- Cole
- Coleman
- Colin
- Colon
- Collin
- Collins
- Colman
- Colter
- Colton
- Conan
- Conley
- Connaire
- Connor
- Conrad
- Constantin
- Constantinos
- Cooper
- Corbin
- Corey
- Corky
- Cormac
- Cornelius
- Cort
- Corwin
- Court
- Courtney
- Craig
- Creighton
- Crews
- Cris
- Crispin
- Crispus
- Cristian
- Cristobal
- Cullen
- Curcio
- Curran
- Curt
- Curtis
- Cuthbert
- Cy
- Cyrek
- Cyril
- Cyrill
- Cyrus
- Czeslaw
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