| Kaspars | | - | Latvian | |
| Kasper | | KAHS-per (Polish, Swedish), KAHS-pər (Dutch) | Polish, Dutch, Swedish, Norwegian, Danish | |
| Kassandra | | kə-SAN-drə (English) | Greek Mythology, Ancient Greek, English (Modern) | |
| Kassandros | | - | Ancient Greek | |
| Kasumi | | kah-soo-mee | Japanese | |
| KatÓ | | - | Hungarian | |
| Kata | | KAH-tah (Finnish) | Hungarian, Finnish, Croatian | |
| Katalin | | KAWT-aw-leen (Hungarian) | Hungarian, Basque | |
| Katalinka | | - | Hungarian | |
| Katar | | - | Armenian | |
| Katariina | | KAH-tah-ree:-nah (Finnish) | Finnish, Estonian | |
| Katarina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | |
| Katarine | | kah-tah-REE-nə | German | |
| Katashi | | kah-tah-shee | Japanese | |
| Katayun | | - | Persian | |