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| Name | Total | Name | Total | Name | Total | Name | Total | Name | Total |
|---|---|---|---|---|---|---|---|---|---|
| Cromwell | 2 | Cornelius | 1 | Capet | 12 | Casduff | 1 | Caisfhiachlach | 1 |
| Cruitheantuaidh | 1 | Conklin | 1 | Capet de Marvois | 1 | Chalock | 1 | Cealgach | 1 |
| Croft | 1 | Caldwell | 1 | Capet de Neustria | 1 | Caspian Sea, The | 1 | Caolbreag | 1 |
| Cope | 4 | Cornell | 3 | Caroling | 1 | Clair, St. | 4 | Cruthach | 1 |
| Clark | 4 | Campbell | 5 | Castille, Of | 2 | Clement | 1 | Corbeil, De | 2 |
| Clutter | 1 | Cardenas | 1 | Chatellerault, De | 1 | Church | 2 | Crepon, De | 2 |
| Carr | 1 | Cutter | 3 | Chateau-du-Loire, De | 1 | Crawford, De | 1 | - | - |
| Cooley | 1 | Choury | 1 | Chapman | 1 | Chadhach | 1 | - | - |
| Canty | 1 | CULEMBORG, VAN | 1 | Clarke | 2 | Cruitheantuaidh, de | 1 | - | - |
| Coe | 1 | Craycroft | 1 | Cameron | 2 | Carpenter | 1 | - | - |