- Claas
- Claasen
- Claassen
- Clabaut
- Clack
- Claeijs
- Claerhout
- Claes
- Claesen
- Claesens
- Claessen
- Claessens
- Claeys
- Claire
- Clancey
- Clancy
- Clant
- Clapdorp
- Clapper
- Clara
- Clarck
- Clardy
- Clare
- Claremont
- Claret
- Clarijs
- Clarinda
- Claris
- Clarisse
- Clark
- Clarke
- Clarkson
- Claro
- Clasen
- Clasing
- Clason
- Clasquin
- Classen
- Claude
- Claudius
- Claus
- Clausen
- Clauser
- Clausing
- Clausman
- Claussen
- Clauw
- Clavan
- Clavel
- Clavell
- Claver
- Clavier
- Clavijo
- Claxton
- Clay
- Clayden
- Clayman
- Clayton
- Clayworth
- Cleal
- Clean
- Clear
- Cleary
- Cleaver
- Cleber
- Clee
- Cleef
- Cleer
- Clegg
- Cleghorn
- Cleijman
- Clein
- Clemares
- Clemencia
- Clemens
- Clement
- Clemente
- Clementina
- Clements
- Clementson
- Clerc
- Clerck
- Clerckx
- Clercq
- Clercx
- Clerk
- Clerkx
- Clermont
- Clerx
- Cleutjens
- Cleva
- Cleve
- Cleven
- Clever
- Cleveringa
- Cleverley
- Cleverly
- Cley
- Cleyne
- Cleypool
- Cliff
- Clifford
- Clifton
- Clignet
- Clignett
- Climo
- Clin
- Cline
- Clinton
- Clitheroe
- Clivio
- Clocquet
- Cloe
- Cloeck
- Cloet
- Cloete
- Cloin
- Cloos
- Cloosen
- Cloosterman
- Cloot
- Cloots
- Cloppenburg
- Close
- Closmann
- Closset
- Clothier
- Cloud
- Cloudt
- Clouet
- Clough
- Clous
- Clout
- Cluff
- Clugnet
- Cluitmans
- Clyde
- Clydesdale