| Name | # Entries |
|---|---|
| Clearson | 4 |
| Cashmere | 5 |
| Cash Tobin | 1 |
| Casic | 1 |
| Casillas | 0 |
| Casipillai | 0 |
| Casipit | 3 |
| Casis | 2 |
| Caska | 4 |
| Casken | 1 |
| Casinto | 0 |
| Casippillai | 1 |
| Capuzza | 2 |
| Caracasidis | 3 |
| Caraco | 2 |
| Caracoudis | 2 |
| Carageorge | 0 |
| Carageorgos | 1 |
| Caraig | 10 |
| Carallis | 0 |
| Caramancion | 1 |
| Carameli | 6 |
| Caramidaru | 1 |
| Caraffi | 1 |
| Coxsen | 7 |
| Cox Taylor | 2 |
| Callinan | 189 |
| Callos | 5 |
| Callose | 2 |
| Chase Dunlop | 0 |
| Chass | 1 |
| Chassar | 5 |
| Chassis | 1 |
| Coolwell | 6 |
| Coomaraswamy | 9 |
| Coomb | 2 |
| Constantini | 2 |
| Chudyba | 1 |
| Chudyk | 3 |
| Chudziak | 6 |
| Chueh | 11 |
| Chugh | 20 |
| Chuka | 2 |
| Chukka | 0 |
| Chukri | 1 |
| Chulio | 3 |
| Chum | 18 |
| Chuma | 7 |
| Chumacero | 2 |
| Chumbers | 1 |
| Chuke | 0 |
| Chukkirian | 0 |
| Chulapong | 1 |
| Chummun | 4 |
| Constantopedos | 3 |
| Constantiou | 2 |
| Constant Marmillon | 1 |
| Contardo | 7 |
| Contarini | 2 |
| Contatore | 8 |
| Crest | 3 |
| Cresta | 6 |
| Chance | 75 |
| Chancey | 2 |
| Chanclon Nevado | 1 |
| Chanco | 2 |
| Chand | 560 |
| Chancerel | 0 |
| Coward Lemke | 0 |
| Cowarn | 4 |
| Cowasjee | 1 |
| Cowasji | 1 |
| Cowban | 0 |
| Cowdell | 25 |
| Cowcher Guthrie | 0 |