| CEARA f English (Rare) |
| CEARRA f English (Rare) |
| CHIARA f Italian |
| CHIARINA f Italian |
| CIAR m Irish |
| CIARA (1) f Irish |
| CIARA (2) f English (African American, Modern) |
| CIARÁN m Irish |
| CIERA f English (Modern) |
| CIERRA f English (Modern) |
| CLAIR m French, English |
| CLAIRE f French, English |
| CLARA f Italian, German, Spanish, Portuguese, Catalan, Romanian, English, Late Roman |
| CLARE f English |
| CLARETTA f Italian |
| CLARETTE f English (Rare) |
| CLARIBEL f English |
| CLARICE f English |
| CLARINDA f English |
| CLARISA f Spanish |
| CLARISSA f English, Italian, Portuguese |
| CLARISSE f French |
| CLARITIA f Late Roman |
| CLARUS m Late Roman |
| KEARA f English (Modern) |
| KEIRA f English (Modern) |
| KEIRAN m English (Rare) |
| KERI f English |
| KERRI f English |
| KERRIE f English |
| KERRY m & f English |
| KIARA f English (Modern) |
| KIARAN m English (Rare) |
| KIARRA f English (Modern) |
| KIERA f Irish |
| KIERAN m Irish |
| KIERON m Irish |
| KIERRA f English (Modern) |
| KIRA (2) f English |
| KLÁRA f Hungarian, Czech, Slovak |
| KLĀRA f Latvian |
| KLARA f Scandinavian, German, Russian, Ukrainian, Polish, Slovene, Croatian |
| KYRA f English |
| KYRAN m Irish |
| PIRAN m Cornish |
| SIERRA f English (Modern) |
| SINCLAIR m English (Rare) |
