- Caballero
- Cabazos
- Cabel
- Cabianca
- Caccamise
- Caccavale
- Cade
- Cadena
- Cady
- Caffrey
- Cahill
- Caid
- Caillouet
- Cain
- Cairns
- Cajero
- Calcagno
- Calderon
- Calderone
- Caldwell
- Calhoun
- Califra
- Calkins
- Call
- Callahan
- Callen
- Callis
- Calvert
- Calvillo
- Camacho
- Camargo
- Cameron
- Cammarata
- Camp
- Campas
- Campbell
- Campbelll
- Campel
- Campisano
- Campos
- Campuzano
- Canacakos
- Canady
- Candee
- Candelaria
- Canez
- Canning
- Cannon
- Canterman
- Canton
- Cantrell
- Capin
- Caplan
- Capobres
- Capp
- Capple
- Capps
- Caraballo
- Carabetta
- Carbajal
- Cardamone
- Cardenas
- Cardiel
- Cardinale
- Cardoni
- Cardwell
- Carey
- Carfi
- Carhuff
- Caria
- Carino
- Carley
- Carlson
- Carlsten
- Carlton
- Carmichael
- Carmody
- Carnahan
- Carnarius
- Carney
- Caron
- Carouso
- Carpenter
- Carper
- Carr
- Carranza
- Carrasco
- Carreon
- Carrico
- Carriere
- Carrigan
- Carrillo
- Carrington
- Carroll
- Carrozza
- Carson
- Carsten
- Carstens
- Cartaya
- Carter
- Cartier
- Cartwright
- Caruso
- Casa
- Casadei
- Caschera
- Case
- Casebeer
- Casey
- Cashman
- Casiraghi
- Casoni
- Casper
- Cassels
- Cassidy
- Castaneda
- Castano
- Castell
- Castellanos
- Castellon
- Castillo
- Castillo-Gaudar
- Castle
- Casto
- Castro
- Catalano
- Cater
- Cates
- Cathey
- Catlett
- Catren
- Catt
- Cavallo
- Cavallucci
- Cavanaugh
- Cavender
- Caviglia
- Cawthorne
- Caywood
- Cecco
- Celaya
- Cella
- Ceniceros
- Censori
- Centeno
- Cento
- Cervantes
- Cervantez
- Cesario
- Chabot
- Chacon
- Chaffee
- Chafouleas
- Chaitt
- Chajewski
- Chalfant
- Challe
- Chamberlain
- Chamberlin
- Chambers
- Chamie
- Chan
- Chandler
- Chaney
- Chapman
- Chappell
- Charland
- Charles
- Charron
- Chartier
- Chase
- Chatel
- Chatfield
- Chatterson
- Chaudhary
- Chauvet
- Chavarria
- Chavez
- Chawla
- Chayka
- Checkon
- Cheema
- Cheeseman
- Chen
- Cherba
- Cherry
- Chesnick
- Chesnik
- Chess
- Cheung
- Chhay
- Chiasson
- Chiknas
- Childers
- Chilton
- Chimos
- Chin
- Chinn
- Chiorazzi
- Chipman
- Chiquette
- Chisholm
- Chism
- Chivers
- Chlastawa
- Chliwnyj
- Chlup
- Cho
- Chonis
- Choquette
- Chrisman
- Christensen
- Christian
- Christians
- Christiansen
- Christmon
- Christopher
- Christopherson
- Christy
- Chu
- Chubarov
- Chuk
- Chumbler
- Chung
- Churchill
- Ciaramello
- Cichocki
- Cichy
- Cihon
- Cillitto
- Cimetta
- Cimmino
- Ciresa
- Cisco
- Cisneros
- Ciuffetelli
- Ciuffo
- Ciula
- Civetta
- Claassen
- Clancy
- Clapp
- Claps
- Clare
- Clark
- Clashman
- Clatanoff
- Clauer
- Clausen
- Claybaugh
- Clayton
- Cleer
- Clelland
- Clemensen
- Clement
- Clements
- Clemmons
- Clennon
- Cleveland
- Clevinger
- Clifford
- Clifton
- Clinch
- Cline
- Clingensmith
- Clinton
- Close
- Cloud
- Clouthier
- Clymer
- Coates
- Coats
- Cobb
- Coble
- Coburn
- Cochran
- Cockayne
- Coffey
- Coffin
- Coffman
- Coglan
- Cogswell
- Cohen
- Cohn
- Cojanis
- Colbeck
- Cole
- Coleman
- Colip
- Collett
- Collie
- Collier
- Colling
- Collins
- Collinson
- Collura
- Colman
- Colpitts
- Colton
- Colussy
- Colville
- Colvin
- Colwell
- Comaduran
- Comer
- Comey
- Comiskey
- Comisso
- Comolli
- Compitello
- Compton
- Comrie
- Conarro
- Conboy
- Condit
- Condon
- Cone
- Confair
- Confer
- Conklin
- Conn
- Connell
- Connelly
- Conner
- Connick
- Connolly
- Connors
- Conrad
- Conroy
- Consdorf
- Consoli
- Conte
- Contento
- Contestable
- Conti
- Contreras
- Conway
- Cook
- Cook-Miller
- Cooke
- Cooksey
- Cookson
- Cooley
- Coon
- Cooper
- Copeland
- Copeskey
- Coppens
- Copper
- Coppola
- Corbett
- Corbin
- Corcoran
- Cordell
- Cordes
- Cordova
- Cords
- Corella
- Corkill
- Cormier
- Corn
- Cornell
- Cornewal
- Corns
- Corodado
- Coronado
- Corral
- Corrales
- Corrick
- Corrigan
- Corsey
- Corsi
- Cortesi
- Cortez
- Cosby
- Cosentino
- Cosgrove
- Cosio
- Cosper
- Coss
- Costa
- Costello
- Cota
- Cote
- Cotner
- Cotton
- Coty
- Couch
- Couchman
- Coull
- Coulter
- Coulthart
- Countryman
- Counts
- Cournoyer
- Courson
- Court
- Courville
- Coury
- Cousy
- Coutts
- Couture
- Cover
- Coville
- Cowan
- Coward
- Cowman
- Cox
- Coxon
- Coy
- Coyle
- Coyne
- Crabb
- Crabbe
- Craddock
- Crager
- Craig
- Craine
- Cramer
- Crandall
- Crane
- Crawford
- Crawley
- Creal
- Creamer
- Creek
- Cretcher
- Crick
- Crino
- Crisp
- Crist
- Criswell
- Crites
- Crittenden
- Crocker
- Crockett
- Croddy
- Crofoot
- Croft
- Croissant
- Cronk
- Crook
- Crosby
- Cross
- Croteau
- Crotts
- Crouch
- Crouse
- Crowe
- Crowell
- Crowley
- Crowninshield
- Croxton
- Croy
- Cruz
- Csop
- Cuadrado
- Cuen
- Cuesta
- Cueto
- Cuevas
- Culbertson
- Cumberland
- Cumings
- Cummings
- Cummins
- Cundiff
- Cunningham
- Cuppe
- Curd
- Curdo
- Curran
- Currie
- Currin
- Curry
- Curtis
- Cusack
- Cushing
- Custodio
- Cutforth
- Cuthbertson
- Cutlip
- Cutrules
- Cuvelier
- Czlapka