- Caamano
- Caba
- Cabal
- Caballero
- Caban
- Cabanas
- Cabarcos
- Cabarga
- Cabell
- Cabello
- Cabera
- Cabeza
- Cabezas
- Cabrera
- Cabrerizo
- Cacciatore
- Cacciavillani
- Cacciotti
- Caceres
- Cachaldora
- Cacheiro
- Cadaval
- Cadenas
- Cadieu
- Caesar
- Cahn
- Caiaffa
- Caicedo
- Caines
- Cairo
- Cajina
- Cala
- Calado
- Calaf
- Calante
- Calcines
- Caldera
- Calderin
- Calderon
- Calduch
- Caldwell
- Calero
- Calhoun
- Calienes
- Calixte
- Calixto
- Calkins
- Callaghan
- Callahn
- Calle
- Calleja
- Callejas
- Calles
- Calvet
- Calvin
- Calvino
- Calvo
- Calzada
- Camacho
- Camara
- Camaraza
- Camarero
- Cambara
- Cambridge
- Camcho
- Camejo
- Cameron
- Cameros
- Camesi
- Camilo
- Camino
- Camman
- Camner
- Camoira
- Camp
- Campa
- Campana
- Campaneria
- Campbell
- Campello
- Campillo
- Campilongo
- Campins
- Campo
- Campos
- Camps
- Canada
- Canal
- Canales
- Canamero
- Canary
- Canavaggio
- Cancio
- Candelaria
- Candio
- Canelas
- Canet
- Canete
- Cangemi
- Canino
- Canizares
- Cannata
- Cannon
- Cano
- Cantallops
- Cantillo
- Cantine
- Cantos
- Cantrell
- Cantrelle
- Canty
- Cap
- Capaz
- Capbell
- Capella
- Capelo
- Capers
- Capilla
- Capistrano
- Caplan
- Caplin
- Capo
- Caporale
- Capote
- Cappelletti
- Capra
- Captain
- Capuano
- Caraballo
- Carabelo
- Caralt
- Caram
- Carbajal
- Carbajales
- Carballal
- Carballeira
- Carballo
- Carballosa
- Carberry
- Carbone
- Carbonell
- Carbonero
- Carbot
- Carcamo
- Carcana
- Carcases
- Cardani
- Cardenal
- Cardenas
- Cardet
- Cardillo
- Cardin
- Cardona
- Cardons
- Careaga
- Carey
- Carias
- Caride
- Cario
- Caris
- Carlin
- Carlson
- Carmenate
- Carmenates
- Carmona
- Carnero
- Carney
- Carnot
- Caro
- Carol
- Carosio
- Carozzi
- Carpenter
- Carper
- Carr
- Carral
- Carranque
- Carranza
- Carrasco
- Carrasquillo
- Carratala
- Carreno
- Carreon
- Carrera
- Carreras
- Carriere
- Carrigan
- Carrillo
- Carrion
- Carrodeguas
- Carroll
- Carruitero
- Carruyo
- Carson
- Carswell
- Cartaya
- Carter
- Cartledge
- Caruncho
- Carvajal
- Carvalho
- Carver
- Casabalayala
- Casado
- Casal
- Casale
- Casales
- Casamayor
- Casanas
- Casanova
- Casar
- Casares
- Casas
- Casaudoumecq
- Cascante
- Caselli
- Cases
- Cash
- Casimir
- Casper
- Caspio
- Casseus
- Cassidy
- Cassimire
- Castaneda
- Castaner
- Castano
- Castanon
- Casteleiro
- Castellano
- Castellanos
- Castelle
- Castello
- Castellon
- Castellucci
- Castellvi
- Castex
- Castilla
- Castillo
- Castineira
- Casto
- Castro
- Catach
- Catalano
- Catalla
- Catapano
- Cates
- Cato
- Catti
- Catton
- Cauley
- Cavadas
- Cavalaris
- Cavelier
- Cawley
- Cayasso
- Cayon
- Cazas
- Cazobon
- Ceavers
- Cebey
- Cebrecos
- Cecchini
- Cedeno
- Celaya
- Celdran
- Celeiro
- Cenal
- Cendoya
- Centeno
- Centurion
- Cepero
- Ceran
- Cerchiai
- Cerda
- Cerdido
- Cerilo
- Cermelli
- Ceron
- Cerra
- Cerutti
- Cervantes
- Cervera
- Cervone
- Cesarano
- Cesarano-Kinard
- Cespedes
- Cevasco
- Chace
- Chacha
- Chacon
- Chaffin
- Chafin
- Chahine
- Chai
- Chaidez
- Chaifetz
- Chaisuesomboon
- Chaitman
- Chalem
- Chalker
- Chamberlain
- Chambers
- Chamorro
- Chan
- Chanel
- Chang
- Chao
- Chaparro
- Chapman
- Chappel
- Chappell
- Chappelle
- Charest
- Charles
- Charlot
- Charrier
- Charron
- Chase
- Chaskes
- Chason
- Chassen
- Chasteen
- Chauca
- Chavarria
- Chavarriaga
- Chavarry
- Chaves
- Chavez
- Chaviano
- Chaw
- Chayter
- Cheddesingh
- Chedrau
- Cheeran
- Chemaly
- Chen
- Cheng
- Cherelus
- Cherenek
- Cherfrere
- Chernes
- Cherry
- Chesky
- Chess
- Cheung
- Chevere
- Chewning
- Chi
- Chickillo
- Chicvara
- Chieng
- Chifari
- Childress
- Childs
- Chillon
- Chimbor
- Chimerakis
- Chin
- Ching
- Chinn
- Chinsee
- Chinsky
- Chiocca
- Chiong
- Chipi
- Chiriboga
- Chirino
- Chirinos
- Chisholm
- Chisolm
- Chiu
- Chohan
- Chok
- Cholley
- Chomat
- Chomor
- Chong
- Choque
- Choter
- Chow
- Chowdhury
- Choy
- Chrisitian
- Christensen
- Christy
- Chruszcz
- Chrystal
- Chu
- Chugani
- Chung
- Church
- Churchill
- Chutkan
- Ciardi
- Cias
- Cibran
- Ciccarone
- Cicero
- Cid
- Cieply
- Cifuentes
- Cineas
- Cinnamon
- Cirillo
- Cirisano
- Ciscar
- Cisneros
- Citarella
- Ciura
- Clakley
- Clancey
- Clarington
- Clark
- Clarke
- Claro
- Claude
- Claudio
- Claure
- Clausell
- Clausen
- Clauss
- Clavan
- Clavel
- Clavelo
- Clavero
- Clay
- Clayman
- Clayton
- Clear
- Clegg
- Clein
- Cleland
- Clements
- Clemetson
- Clemo
- Clemons
- Clervil
- Clevenger
- Climent
- Clinche
- Cline
- Clouden
- Coakley
- Coard
- Coates
- Coats
- Cobaugh
- Cobb
- Cobbs
- Cobiella
- Cobin
- Coca
- Cochez
- Codina
- Codorniu
- Coe
- Coello
- Coffee
- Coffin
- Cofield
- Cofino
- Cogdell
- Cohen
- Cohn
- Coira
- Coiras
- Cojab
- Coker
- Colado
- Colan
- Colberg
- Colburn
- Colby
- Cold
- Cole
- Colebrook
- Colegial
- Coleman
- Colet
- Colina
- Colino
- Coll
- Collada
- Collado
- Collage
- Collantes
- Collao
- Collazo
- Collazos
- Coller
- Collette
- Colley
- Collier
- Collins
- Collongette
- Colmenero
- Colombey
- Colombie
- Colon
- Colsky
- Colson
- Colt
- Comas
- Comerford
- Como
- Comome
- Companioni
- Comrie
- Concepcion
- Conde
- Condon
- Conea
- Confident
- Conklin
- Conkling
- Conley
- Conlin
- Conner
- Connolly
- Connor
- Connors
- Conrad
- Conroy
- Constantino
- Consuelo
- Contreras
- Convers
- Conway
- Conyers
- Cook
- Cooke
- Coombs
- Coon
- Cooner
- Cooper
- Cooperman
- Copeland
- Copin
- Copland
- Coppo
- Coquet
- Cora
- Corazza
- Corbitt
- Corbo
- Corces
- Corcoran
- Cordero
- Cordoba
- Cordonez
- Cordova
- Cordoves
- Cordoves-Maleta
- Cordovi
- Corea
- Corella
- Corirossi
- Cork
- Cormier
- Cornejo
- Cornelius
- Corniel
- Coronado
- Coronel
- Corradino
- Corral
- Corrales
- Correa
- Corredeira
- Corrieri
- Corsanego
- Corsbie
- Cortes
- Cortez
- Cortina
- Cortinas
- Corvoisier
- Corzo
- Cos
- Cosby
- Cosculluela
- Cosio
- Cossio
- Costa
- Costales
- Cotarelo
- Cote
- Cotelo
- Cotera
- Coto
- Coton
- Couce
- Couceyro
- Coumakis
- Coureaux
- Couric
- Cournoyer
- Courtelis
- Courtemanche
- Courtney
- Couto
- Covington
- Cowan
- Coward
- Cowen
- Cox
- Coya
- Cozzo
- Craddock
- Craft
- Craig
- Cramer
- Cratit
- Craven
- Cravez
- Crawford
- Craythorne
- Creagh
- Creary
- Creech
- Creed
- Creevay
- Crespi
- Crespo
- Crews
- Cribeiro
- Crick
- Criden
- Crider
- Crockett
- Croke
- Cromer
- Crompton
- Croon
- Crosscooper
- Crouch
- Crowther
- Cruz
- Cuadra
- Cuartas
- Cubas
- Cubillas
- Cuculiza
- Cuelez
- Cueli
- Cuellar
- Cuello
- Cuenca
- Cuero
- Cuesta
- Cueto
- Cuevas
- Culmer
- Culmo
- Culpepper
- Culshaw
- Cummings
- Cummins
- Cumplido
- Cunado
- Cunningham
- Cunninghan
- Cupido
- Cura
- Curbelo
- Curlett
- Curmanskie
- Curras
- Curry
- Curtis
- Curto
- Custodio
- Cutie
- Cutler
- Cuzan
- Cypen
- Cyr
- Czerniejewski