| Karlo | | KAHR-lo | Croatian | |
| Karmela | | - | Croatian | |
| Karmen | | - | Slovene, Croatian | |
| KarolÍNa | | - | Czech | |
| Karolina | | kah-raw-LEE-nah (Polish), kah-ro-LEE-nah (Swedish, German) | Polish, Swedish, Norwegian, Danish, Hungarian, Slovene, Croatian, Macedonian, Lithuanian, German | |
| Karpos | | - | Ancient Greek, Biblical Greek | |
| Kasimira | | kah-zee-MEE-rah | German (Archaic) | |
| 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 | |
| Kata | | KAH-tah (Finnish) | Hungarian, Finnish, Croatian | |
| Katarina | | kah-tah-REE-nah (German, Swedish) | German, Swedish, Norwegian, Danish, Hungarian, Croatian, Serbian, Slovene | |
| Kate | | KAYT (English) | English, Croatian | |
| KateŘIna | | - | Czech | |
| Katelijn | | kah-tə-LIEN | Dutch | |