- Cabaniss
- Cabbler
- Cabiness
- Caddy
- Cahill
- Caldwell
- Calhoon
- Calkin
- Call
- Callahan
- Callaway
- Callis
- Calloway
- Calvert
- Camden
- Campbell
- Camper
- Candler
- Canfield
- Cannon
- Canova
- Capito
- Cardwell
- Carey
- Cargill
- Carico
- Carl
- Carlin
- Carlisle
- Carmack
- Carneal
- Carney
- Carpenter
- Carper
- Carr
- Carrell
- Carroll
- Carson
- Carter
- Carty
- Carver
- Casey
- Cash
- Casola
- Cassell
- Cassels
- Catlett
- Caudill
- Celin
- Chambers
- Chandler
- Chang
- Chanthavongsa
- Chao
- Chapman
- Chattin
- Cheney
- Cherry
- Chesnutt
- Chewning
- Chichester
- Chilcoat
- Childress
- Chilman
- Chittum
- Chitwood
- Chivas
- Christian
- Christley
- Chubb
- Cibelli
- Circeo
- Clapp
- Clapsaddle
- Clark
- Clarke
- Clarkson
- Clasbey
- Clatterbuck
- Clay
- Claye
- Clayton
- Claytor
- Clem
- Clemens
- Clemons
- Clendening
- Cleveland
- Clevenger
- Click
- Clifton
- Cloeter
- Close
- Coake
- Cobb
- Coburn
- Cockram
- Cody
- Coffey
- Coffman
- Coger
- Coiner
- Cole
- Coleman
- Coles
- Coliton
- Collins
- Colozza
- Combs
- Comer
- Conley
- Conner
- Conte
- Conway
- Cook
- Coolbaugh
- Cooper
- Copeland
- Corbett
- Corbin
- Corbitt
- Corvin
- Cosby
- Costigan
- Cotsamire
- Coughlin
- Counts
- Courey
- Coven
- Coward
- Cowher
- Cox
- Coyer
- Craft
- Craghead
- Craig
- Craighead
- Crane
- Cranston
- Cranwell
- Craun
- Crawford
- Creasy
- Cregger
- Cress
- Cribbs
- Crickenberger
- Criner
- Crocker
- Croft
- Cromer
- Crommett
- Cromwell
- Cronau
- Croner
- Cronin
- Crosswhite
- Crouse
- Crowder
- Crowgey
- Crowley
- Crumley
- Crump
- Cuddy
- Culbertson
- Cullop
- Cumbow
- Cummings
- Cummins
- Cundiff
- Cunningham
- Cupp
- Currie
- Curry
- Curtis
- Custer
- Cutright
- Cyphers