| Kristin | | kris-TEEN (Swedish, German), KRIS-tin (English) | Swedish, Norwegian, Danish, German, English | |
| Kristina | | kris-TEE-nah (German) | Swedish, Norwegian, Danish, Russian, German, Slovene, Czech, Lithuanian, Serbian, Croatian, Faroese, | |
| Kristine | | kris-TEEN (English), kris-TEE-nə (German) | Norwegian, Danish, Swedish, English, German | |
| Kristjan | | - | Estonian, Slovene | |
| Kristopher | | KRIS-tə-fər | English | |
| Kristy | | KRIS-tee | English | |
| Krystal | | KRIS-təl | English | |
| Krystelle | | - | English (Rare) | |
| Krysten | | KRIS-tin | English (Modern) | |
| Krystina | | - | English (Modern) | |
| Krystine | | - | English (Rare) | |
| Krystle | | KRIS-təl | English (Modern) | |
| Ksenija | | - | Serbian, Croatian, Macedonian, Slovene | |
| Kumar | | - | Indian, Hindi, Marathi, Bengali, Assamese, Odia, Gujarati, Punjabi, Tamil, Telugu, Malayalam, Kannad | |
| Kunal | | - | Indian, Hindi, Marathi, Bengali, Gujarati, Punjabi | |