| Name | Date | Month | Icon | Bios |
| CASIANI (Kasiani) | 7 | September | | |
| CASIANOS (Cassianos, Kassianos, Casianos, Kasianos, Casos, Kasos) | 29 | February |  |  |
| CATHOLIC EASTER (*) (Catholic Easter) | 20 | April | | |
| CATHRINE (Aikaterine, Aikaterini, Katerina, Kaiti, Karen, Caren, Carin, Caron, Caronn, Carren, Carrin, Carron, Carryn, Caryn, Carynn, Carynne, Karan, Kari, Karin, Karna, Karon, Karren, Karrin, Karryn, Karyn, Kerran, Kerrin, Kerron,Kerrynn,Keryn,Kerynne) | 25 | November |  |  |
| CECILIA (Cecilia, Kikilia, Kekilia, Cecil) | 22 | November | | |
| CEDD (Cedd) | 7 | January |  |  |
| CHARLES (Charles, Karolos, Carolos, Carol, Caroline) | 0 | not known | | |
| CHLOE (*) (Chloe) | 16 | February |  |  |
| CHRISTIAN (Christian) | 24 | May | |  |
| CHRISTINA (1) (Christina, Christy, Chris, Christyne) | 24 | July |  |  |
| CHRISTINA (2) (Christina, Christy, Chris, Christyne, Christoli) | 25 | December | | |
| CHRISTODOULOS (1) (Christodoulos) | 16 | March | | |
| CHRISTODOULOS (2) (Christodoulos) | 21 | October | | |
| CHRISTOPHER (Christoforos) | 9 | May |  |  |
| CHRISTOS (Christos, Christis) | 25 | December | | |
| CHRYSANTHI (Crysanthi, Hrisanthi, Hrysanthi) | 25 | October |  |  |
| CHRYSANTHIS (Hrysanthi, Chrysanthi, Chrysanthis) | 19 | March | | |
| CHRYSI (1) (Chrysi) | 30 | January |  |  |
| CHRYSI (2) (Chrysi) | 13 | October |  |  |
| CHRYSTALLA (Chrystalla, Hrystalla, Chrystalia) | 25 | December | | |
| CLAUDIA (Claudia) | 20 | March |  |  |
| CLEAN MONDAY (*) (Clean Monday) | 3 | March | | |
| CLEO (Clio) | 1 | September |  |  |
| CLEOPATRA (1) (Cleopatra, Kleopatra, Patra, Patroula, Cleo) | 1 | September |  |  |
| CLEOPATRA (2) (Cleopatra, Kleopatra, Patra, Patroula, Cleo) | 19 | October |  |  |
| CONSTANTIN (Konstantinos, Kostantinos, Kostas, Costas, Constantine, Costantine, Gus) | 21 | May | | |
| CONSTANTINA (Thina, Kostantina, Dina, Costantina) | 21 | May | | |
| CONSTANTIOS (Costantios, Kostantios, Costantia, Kostantia, Dia, Constantios, Konstantios, Constantia, Konstantia) | 26 | December |  |  |
| CORALIA (Koralia, Koralou) | 1 | September |  |  |
| CORNELIUS (Kornelios, Kornilios, Kornelia) | 13 | September | | |
| CORTESSA (Cortessa, Kortessa, Tessa) | 0 | not known | | |
| COSMAS (1) (Kosmas) | 1 | July | | |
| COSMAS (2) (Kosmas) | 1 | November |  |  |
| COSMAS (3) (Kosmas) | 22 | September |  |  |
| CYPRIANOS (Kiprianos) | 2 | October | | |
| CYRILLOS (Kyrillos, Cyril) | 18 | January |  | |