- Cabarrabang
- Cabral
- Cabunoc
- Cacitti
- Cackler
- Caday
- Cadwallader
- Caglia
- Cai
- Cajes
- Calcagno
- Calcaterra
- Caldera
- Caldwell
- Calgher
- Calhoun
- Cali
- Calkins
- Call
- Callaghan
- Callahan
- Calundan
- Calvello
- Calvert
- Calzia
- Camacho
- Cambra
- Cambron
- Camerino
- Campbell
- Campeau
- Campisi
- Campos
- Canares
- Canario
- Cancilla
- Candelario
- Candell
- Canlas
- Cannan
- Cannestra
- Cannino
- Cannizzaro
- Cannon
- Cantlen
- Cantrell
- Canup
- Cao
- Caparelli
- Capistrano
- Capuano
- Capurso
- Caputo
- Capuz
- Cardenas
- Cardona
- Cardosa
- Cardoso
- Cardoza
- Cardozo
- Carey
- Carlini
- Carlos
- Carlson
- Carman
- Carney
- Caro
- Caron
- Carothers
- Carpenedo
- Carpenter
- Carpentier
- Carper
- Carr
- Carrasco
- Carreno
- Carrerow
- Carrillo
- Carroll
- Carruth
- Carter
- Caruso
- Carvalho
- Casalegno
- Casaletto
- Case
- Caserta
- Caserza
- Casey
- Cashdollar
- Cashman
- Casho
- Casolary
- Casper
- Castelo
- Castillo
- Castleman
- Castro
- Castronovo
- Catania
- Catanzaro
- Catto
- Caudillo
- Cavallaro
- Caver
- Cellini
- Cernac
- Cervantes
- Cervelli
- Cerveny
- Cestone
- Cetani
- Cha
- Chabot
- Chadwick
- Chae
- Chakarova
- Chamberlain
- Chambers
- Champion
- Champlin
- Chan
- Chana
- Chandra
- Chandrasekhar
- Chang
- Chao
- Chapa
- Chapman
- Chappell
- Charles
- Chase
- Chau
- Chaudhuri
- Chavez
- Chavira
- Cheang
- Chellino
- Chen
- Cheng
- Cherry
- Chesnos
- Cheu
- Chew
- Chez
- Chheng
- Chiang
- Chiechi
- Chimienti
- Chin
- Chinevere
- Ching
- Chinone
- Chirco
- Chisholm
- Chistik
- Chitalia
- Chiu
- Chivers
- Cho
- Choe
- Choi
- Chong
- Chorosevic
- Chou
- Chow
- Chowdhury
- Christensen
- Christenson
- Christiansen
- Christy
- Chronert
- Chu
- Chulick
- Chun
- Chung
- Church
- Chyu
- Ciarfella
- Cimino
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- Cis
- Cistulli
- Citti
- Claassen
- Claes
- Clapes
- Clark
- Clarke
- Class
- Claus
- Clawson
- Clem
- Clement
- Clemo
- Clewett
- Clifford
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- Coad
- Coakley
- Coats
- Coburn
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- Cochran
- Codipilly
- Codiroli
- Cody
- Coe
- Coelho
- Coen
- Coetsee
- Cogliandro
- Cohn
- Cojanis
- Colacicco
- Colaizzi
- Cole
- Coleman
- Colla
- Collier
- Colligan
- Collins
- Compeau
- Compton
- Compuesto
- Comstock
- Conanan
- Conigliaro
- Conklin
- Connel
- Connell
- Conner
- Connolly
- Connor
- Conrardy
- Constantino
- Consul
- Conway
- Cook
- Coole
- Cooley
- Cooper
- Coran
- Corbett
- Cordell
- Cordova
- Corfman
- Cornwell
- Corpus
- Corpuz
- Corrick
- Corsen
- Corsiglia
- Cortese
- Cortez
- Cosgrove
- Costa
- Costanza
- Costello
- Cota
- Cotriss
- Coughlin
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- Courtney
- Coustier
- Couto
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- Covello
- Coward
- Cowles
- Cox
- Coy
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- Craig
- Crary
- Cravalho
- Crawford
- Crawley
- Creamer
- Credi
- Cree
- Creech
- Crews
- Crim
- Crist
- Cronin
- Cronk
- Crosby
- Cross
- Croteau
- Crow
- Crowell
- Cruise
- Cruz
- Csaplar
- Cseh
- Cuasay
- Cudal
- Cui
- Culberson
- Cummins
- Cunanan
- Cundall
- Cunningham
- Cureton
- Curiel
- Curnow
- Curnutt
- Curtis
- Cyester
- Cyr