| Katelijne | | kah-tə-LIE-nə | Dutch | |
| Katerina | | - | Macedonian, Russian, Bulgarian, Greek, Late Roman | |
| Katica | | - | Croatian, Slovene, Hungarian | |
| Katina | | - | Greek, Macedonian | |
| Katinka | | kah-TING-kah (German) | German, Dutch | |
| Katja | | KAHT-yah (German, Dutch) | German, Swedish, Norwegian, Danish, Dutch, Slovene | |
| Katka | | KAHT-kah | Czech, Slovak | |
| Katlego | | - | Southern African, Tswana | |
| Kato | | - | Eastern African, Ganda | |
| KatrÍN | | - | Icelandic | |
| Katrien | | kaht-REEN | Dutch | |
| Katrijn | | kaht-RIEN | Dutch | |
| Katrina | | kə-TREE-nə (English), kaht-REE-nah (Dutch) | English, German, Swedish, Dutch | |
| Kawacatoose | | - | Native American, Cree | |
| Kay (2) | | - | Welsh Mythology, Arthurian Romance | |