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| Name | Meaning | Gender | Origin |
| Cyrus | Sun | M | Persian |
| Cyryl | Lordly. | M | Polish |
| Cyst | Best. | F | Anglo-Saxon |
| Cystenian | Steady; stable. | M | Welsh |
| Cystennin | Constant. | M | Welsh |
| Cythera | From Cythera. | F | Greek |
| Cytherea | Derived from Cythera/ a Greek island mentioned in classical references to the goddess Aphrodite. Another name for Aphrodite. | F | Greek |
| Cytheria | Goddess of Love | F | Greek |
| Czar | Emperor. Variant of Caesar. | M | Russian |
| Czarina | Feminine of czar. Russian equivalent to a female caesar or empress. | F | Latin |
| Czcibor | Fights with honour. | M | Polish |
| Czeck | Variant of Czeslaw: Glory and honour. | M | Polish |
| Czesiek | Variant of Czeslaw: Glory and honour. | M | Polish |
| Czeslaw | Glory and honour. | M | Polish |
| Czigany | Gypsy. | F | Hungarian |