- Cabales
- Cabeen
- Cable
- Cabone
- Cabuco
- Cachin
- Cagle
- Cain
- Caine
- Caines
- Caldeira
- Calder
- Caldwell
- Calhoun
- Callahan
- Callaway
- Callender
- Callin
- Calma
- Calvert
- Calvin
- Camamile
- Cambell
- Cameron
- Cammon
- Campanaro
- Campaneria
- Campbell
- Camps
- Canaday
- Cangelosi
- Cann
- Cannady
- Cannon
- Cantarini
- Canto
- Cantor
- Cantrell
- Canty
- Caparas
- Cape
- Capers
- Capobianco
- Capps
- Caradine
- Caradonna
- Carden
- Cardenas
- Carey
- Carilli
- Carlisle
- Carlton
- Carlyon
- Carman
- Carmichael
- Carnes
- Caroline
- Carpenter
- Carr
- Carraway
- Carroll
- Carrow
- Carryl
- Carson
- Carsten
- Carswell
- Cart
- Carter
- Cartrett
- Cartrette
- Caruso
- Carver
- Cascone
- Case
- Casebeer
- Caseria
- Casey
- Cash
- Cashen
- Cashwell
- Cason
- Cassette
- Cassidy
- Cassity
- Castaing
- Castaneda
- Casterlin
- Castetter
- Castle
- Castleman
- Castongia
- Castriota
- Castro
- Catanzaro
- Catbagan
- Catherines
- Cathey
- Catlin
- Caton
- Caudill
- Cauley
- Caulk
- Caulkins
- Causer
- Causseaux
- Cauthen
- Cavagna
- Cavallaro
- Cavanaugh
- Cavender
- Cavill
- Cavin
- Caviness
- Cavins
- Cayer
- Cea
- Cereijo
- Cersey
- Chaddock
- Chaderton
- Chadwick
- Chaffin
- Chakrabarti
- Chalkley
- Chamberlin
- Chambers
- Champion
- Champlin
- Chan
- Chance
- Chandra
- Chaney
- Chang
- Channing
- Chapman
- Chappell
- Charest
- Charles
- Charlton
- Charneco
- Charron
- Chascin
- Chase
- Chason
- Chastin
- Chattopadhyay
- Chauncey
- Cheek
- Cheesman
- Chefan
- Cheng
- Cherry
- Chesnutt
- Chester
- Cheung
- Chewning
- Chidester
- Childress
- Chiles
- Chimelewski
- Chin
- Chirila
- Chisholm
- Chitty
- Chitwood
- Choi
- Chopra
- Chornyei
- Chow
- Christensen
- Christian
- Christiansen
- Christianson
- Christofidis
- Christopher
- Chrosniak
- Church
- Ciarimboli
- Ciccarello
- Cicchinelli
- Ciez
- Cissell
- Citrano
- Claiborne
- Clairmont
- Clancy
- Clapp
- Clapsaddle
- Clare
- Clark
- Clarke
- Clarkson
- Claverie
- Claxton
- Clay
- Clayman
- Clayton
- Cleaveland
- Clegg
- Clement
- Clements
- Clemmer
- Clemmons
- Clemnos
- Clemons
- Clifford
- Clift
- Clifton
- Clinard
- Clingenpeel
- Cloud
- Clouse
- Clowers
- Clyatt
- Coan
- Coates
- Coats
- Cobb
- Cochran
- Cockrell
- Cody
- Coffee
- Coffey
- Coffino
- Coffrin
- Cohen
- Cohn
- Coia
- Coker
- Colarusso
- Coldewey
- Cole
- Colegate
- Coleman
- Coles
- Colgrove
- Colina
- Collett
- Colley
- Collier
- Collins
- Colman
- Colmery
- Colon
- Columbus
- Colyer
- Combes
- Combs
- Comer
- Comstock
- Conde
- Condoroteanu
- Coney
- Congdon
- Congressi
- Conklin
- Conlin
- Conn
- Connelly
- Conner
- Connolly
- Connors
- Conrad
- Constantine
- Consul
- Contestabile
- Conway
- Conwell
- Coogan
- Cook
- Cooke
- Cookson
- Cooley
- Cooper
- Copeland
- Copiaco
- Coppock
- Corbett
- Corbin
- Corbit
- Corbitt
- Corcoran
- Cordell
- Cordes
- Corey
- Corlew
- Cornaire
- Cornealy
- Cornelious
- Cornell
- Cornwell
- Corrado
- Corrie
- Corrigan
- Corriveau
- Cortes
- Cortese
- Cosby
- Cosentino
- Cosic
- Costello
- Costin
- Cotia
- Cotney
- Cotten
- Cotton
- Cottrill
- Couch
- Couey
- Coulliette
- Council
- Counts
- Courchene
- Coursey
- Courson
- Courtney
- Covella
- Covert
- Covil
- Covington
- Cowan
- Coward
- Cowart
- Cowdrey
- Cowell
- Cowen
- Cowser
- Cox
- Coxey
- Coy
- Coykendall
- Coyne
- Crabtree
- Crace
- Craddock
- Craft
- Craig
- Crandell
- Crane
- Cratem
- Crawford
- Crawley
- Creech
- Creed
- Creel
- Crews
- Cribb
- Cribbs
- Crider
- Crile
- Crimm
- Cripe
- Cripps
- Crisante
- Crisp
- Criswell
- Crittendon
- Crivaro
- Croasmun
- Crocco
- Crockett
- Croft
- Crofton
- Cronin
- Crook
- Crooks
- Crosby
- Cross
- Crossen
- Crouch
- Croup
- Crouse
- Crow
- Crowe
- Crowley
- Cruel
- Cruise
- Crum
- Crumley
- Crumpler
- Crusaw
- Crutcher
- Crutchfield
- Cruz
- Crygier
- Cubbage
- Cuda
- Cuesta
- Culbertson
- Cullen
- Culleton
- Cullingford
- Culp
- Culpepper
- Culver
- Culverwell
- Cumbee
- Cummings
- Cunningham
- Curiel
- Curran
- Currie
- Currier
- Curry
- Curtis
- Curtiss
- Cushion
- Cushnir
- Cusick
- Cuthbert
- Cuzzort