- C
- Cahill
- Cain
- Caither
- Calahan
- Calcagno
- Caldwell
- Calhoun
- Callahan
- Callan
- Callender
- Callihan
- Callison
- Calliss
- Calquhoun
- Calvert
- Calwell
- CAM
- Camack
- Cammarata
- Campbell
- Camper
- Candica
- Cannaday
- Canney
- Cannon
- Cano
- Canter
- Canterbury
- Canty
- Caper
- Capliner
- Caplingeer
- Caplinger
- Caplinter
- Caputo
- Caracofe
- Caracoff
- Carbaugh
- Cardin
- Cardusu
- Carickhoff
- Caricof
- Caricofe
- Carion
- Carl
- Carlson
- Carmody
- Carmon
- Carner
- Carnes
- Carns
- Carpenter
- Carper
- Carr
- Carrickhoff
- Carrier
- Carroll
- Carson
- Carter
- Carver
- Carwile
- Casady
- Case
- Casey
- Cash
- Casiday
- Casidy
- Casin
- Casler
- Cassiday
- Cassidy
- Cassim
- Castello
- Castetter
- Castle
- Castro
- Catalano
- Caterina
- Catlett
- Catlin
- Catt
- Caul
- Cave
- Cavendish
- Caves
- Cavey
- Cayton
- Cease
- Cenekofsky
- Chafin
- Chagnon
- Chamber
- Chambers
- Chanceaulme
- Chandler
- Chang
- Chaplin
- Chapman
- Chappell
- Charles
- Charleton
- Charlton
- Charltton
- Charton
- Chase
- Chelf
- Chenault
- Cherney
- Cherryholmes
- Chervront
- Chestnut
- Chew
- Childress
- Childs
- Chiles
- Chisholm
- Chittum
- Chocklette
- Chouinard
- Chounce
- Chrisman
- Christ Crist
- Christian
- Christiansen
- Christianson
- Christie
- Christophel
- Chvatal
- Cintron
- Cissel
- Claig
- Clair
- Clare
- Clark
- Clarke
- Clarkson
- Clary
- Clasby
- Clatchey
- Clatterbuck
- Claxton
- Clay
- Claybrook
- Clayter
- Clayton
- Claytor
- Clearley
- Cleary
- Cleek
- Cleer
- Clegg
- Clem
- Clemens
- Clemmens
- Clemmer
- Click
- Clift
- Clifton
- Clindinst
- Cline
- Clinedinst
- Cliser
- Clive
- Cliver
- Clooney
- Clougherty
- Clower
- Clutteur
- Coakely
- Coakley
- Coakus
- Cobb
- Cobbs
- Coberly
- Coceano
- Cochran
- Cockrell
- Coe
- Cofer
- Coffelt
- Coffey
- Cofflet
- Coffman
- Cogswell
- Colavito
- Colaw
- Colbert
- Cole
- Colella
- Coleman
- Collier
- Colligan
- Collins
- Collins or Sullivan
- Collis
- Collyer
- Colquhoun
- Colvill
- Colvin
- Combs
- Comer
- Comfort
- Compton
- Conard
- Conder
- Conelly
- Conger
- Conley
- Conn
- Connelee
- Connell
- Connellee
- Conner
- Connolly
- Connoly
- Connor
- Conquist
- Conrad
- Constable
- Conteh
- Converse
- Cook
- Cooke
- Cookus
- Cool
- Cooley
- Cooney
- Cooper
- Cootes
- Copeland
- Copley
- Copper
- Coran
- Corbin
- Corcoran
- Cordell
- Corder
- Corkery
- Cormier
- Cornell
- Correll
- Corson
- Corum
- Corway
- Cosby
- Costello
- Costner
- Cothron
- Cotledge
- Cott
- Cottonn
- Coughlin
- Cougill
- Couldwall
- Couldwell
- Coulter
- Counts
- Cousin
- Cousins
- Covarrubias
- Cover
- Coverstone
- Cowan
- Cowell
- Cowger
- Cowne
- Cox
- Coxen
- Cozzi
- Crabbe
- Crabill
- Crable
- Craig
- Cramer
- Crantz
- Craun
- Cravens
- Craver
- Crawford
- Crawfprd
- Crawn
- Creasey
- Creasy
- Cregar
- Creger
- Crenshaw
- Cress
- Crest
- Crew
- Crews
- Crickenbarger
- Crickenberger
- Crider
- Crigler
- Crim
- Criss
- Crist
- Cristiano
- Criswell
- Crittenden
- Critzer
- Croch
- Crock
- Crocket
- Crockett
- Crofford
- Croft
- Crokery
- Cromer
- Crompton
- Cron
- Crosbie
- Crosby
- Cross
- Crosswhite
- Crotts
- Crouch
- Crouse
- Croushorn
- Crow
- Crowder
- Crowe
- Crown
- Croxton
- Croy
- Cruikshanks
- Crum
- Crummett
- Crump
- Cruz
- Cubbage
- Cuellar
- Cullen
- Culler
- Cullers
- Culp
- Cultice
- Cumbie
- Cummings
- Cundiff
- Cuningham
- Cunningham
- Cupp
- Curace
- Curns
- Curran
- Curro
- Curry
- Curtis
- Cushen
- Custer
- Cutlip
- Cutright
- Cutshall
- Cykieta