| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 601 | Cydney | English | Variant of Sydney. From St. Denis. | F | |
| 602 | Cym | English | Ruler. | F | |
| 603 | Cymberly | English | From the royal meadow. | F | |
| 604 | Cynburleigh | English | From the royal meadow. | F | |
| 605 | Cyndee | English | Abbreviation of Cynthia and Lucinda. | F | |
| 606 | Cyndi | English | Abbreviation of Cynthia and Lucinda. | F | |
| 607 | Cyndy | English | Abbreviation of Cynthia and Lucinda. | F | |
| 608 | Cyne | English | Ruler. | F | |
| 609 | Cyneburhleah | English | From the royal meadow. | F | |
| 610 | Cyrilla | English | Mistress; lady. Feminine of Cyril. | F | |
| 611 | Dael | English | Lives in the valley. | F | |
| 612 | Daelyn | English | Small valley. | F | |
| 613 | Daena | English | From Denmark. Also a variant of Daniel. | F | |
| 614 | Daesgesage | English | Day's eye. | F | |
| 615 | Dagian | English | Dawn. | F | |
| 616 | Daina | English | From Denmark. Also a variant of Daniel. | F | |
| 617 | Daisey | English | Day's eye. A flower name. | F | |
| 618 | Daisi | English | Day's eye. A flower name. | F | |
| 619 | Daisie | English | Day's eye. A flower name. | F | |
| 620 | Daisy | English | Day's eye, from the old English. Also a flower name. Also a translation of the French Marguerite, and used as a pet form of Margaret. The use of Daisy in the chorus of the song A bicycle built for two made the name Daisy famous. | F | |