| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 501 | Conall | Irish | High and mighty. | M | |
| 502 | Conan | Irish | Hound; elevated. Famous bearer: Talk show host Conan O'Brien. | M | |
| 503 | Conant | Irish | Variant of Conan: Hound; elevated. Famous bearer: Talk show host Conan O'Brien. | M | |
| 504 | Conary | Irish | An ancient Irish name whos meaning is lost in antiquety. | M | |
| 505 | Concepta | Irish | Refers to the Immaculate Conception. | F | |
| 506 | Conchobara | Irish | Feminine form of Connor: strong willed. | F | |
| 507 | Conchobarra | Irish | Feminine form of Connor: strong willed. | F | |
| 508 | Conchobarre | Irish | Feminine form of Connor: strong willed. | F | |
| 509 | Conchobhar | Irish | Strong dog; strong willed or wise. | M | |
| 510 | Concobhar | Irish | Variant of Conchobhar: Strong dog; strong willed or wise. | M | |
| 511 | Congalie | Irish | Constant. | F | |
| 512 | Conlan | Irish | Hero. | M | |
| 513 | Conlen | Irish | Variant of Conlan: Hero. | M | |
| 514 | Conleth | Irish | Ardent or wise. | M | |
| 515 | Conley | Irish | Strong willed or wise. Also a diminutive of Conlan: Hero. | M | |
| 516 | Conlin | Irish | Variant of Conlan: Hero. | M | |
| 517 | Conlon | Irish | Variant of Conlan: Hero. | M | |
| 518 | Conn | Irish | Wise; high and mighty. | M | |
| 519 | Connacht | Irish | Brave or wise. | M | |
| 520 | Connal | Irish | Constant. | F | |