| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 301 | Claudio | Spanish | Lame. | M | |
| 302 | Clementina | Spanish | Merciful. | F | |
| 303 | Clodovea | Spanish | Feminine form of Clodoveo: famous warrior. | F | |
| 304 | Clodoveo | Spanish | Famous warrior. | M | |
| 305 | Coco | Spanish | Abbreviation of Socorro meaning help. | F | |
| 306 | Coleta | Spanish | Victorious. | F | |
| 307 | Concepcion | Spanish | Reference to the Immaculate Conception. | F | |
| 308 | Concetta | Spanish | Reference to the Immaculate Conception. | F | |
| 309 | Conchetta | Spanish | Reference to the Immaculate Conception. | F | |
| 310 | Conrado | Spanish | Spanish form of Conrad 'able counsel'. | M | |
| 311 | Conshita | Spanish | Reference to the Immaculate Conception. | F | |
| 312 | Consolacion | Spanish | Consolation. | F | |
| 313 | Consolata | Spanish | Consolation. | F | |
| 314 | Constantia | Spanish | Constancy; steadfastness. | F | |
| 315 | Constantino | Spanish | Constant. | M | |
| 316 | Constanza | Spanish | Constant. | F | |
| 317 | Consuela | Spanish | Consolation. | F | |
| 318 | Consuelo | Spanish | Consolation. | F | |
| 319 | Corazana | Spanish | Heart. | F | |
| 320 | Corazon | Spanish | Heart. | F | |