| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 541 | Castalia | Greek | Sacred fountain of the Muses. | F | |
| 542 | Castor | Greek | Beaver. Brother of Helen. | M | |
| 543 | Catalin | Greek | Pure. Clear. | F | |
| 544 | Catalyn | Greek | Pure. Clear. | F | |
| 545 | Catarina | Greek | Pure. Clear. | F | |
| 546 | Catharina | Greek | Pure. Clear. | F | |
| 547 | Catherin | Greek | Pure. Clear. | F | |
| 548 | Catherine | Greek | Pure. Famous bearer: Catherine the Great, Empress of Russia. | F | |
| 549 | Catheryn | Greek | Pure. Clear. | F | |
| 550 | Catheryna | Greek | Pure. Clear. | F | |
| 551 | CathIyn | Greek | Pure. Clear. | F | |
| 552 | Cathleen | Greek | Pure. Clear. | F | |
| 553 | Cathlin | Greek | Pure. Clear. | F | |
| 554 | Cathryn | Greek | Pure. Clear. | F | |
| 555 | Cathy | Greek | Form of the Greek Catherine meaning 'pure'. | F | |
| 556 | Catia | Greek | Pure. Clear. | F | |
| 557 | Catriona | Greek | Variant of Katrina: Pure. Clear. | F | |
| 558 | Caycee | Greek | Abbreviation of Acacia meaning guileless. | F | |
| 559 | Cecrops | Greek | Founder of Athens. | M | |
| 560 | Celaeno | Greek | A Harpy. | F | |