| Juliane | | yoo-lee-AH-nə (German) | French, German | |
| Julie | | zhuy-LEE (French), YOO-lee-e (Danish), YUW-lye (Czech), JOO-lee (English) | French, Danish, Norwegian, Czech, English, German, Dutch, Spanish, Portuguese | |
| Julius | | YOO:-li-uws (Ancient Roman), JOO-lee-əs (English), YOO-lee-uws (German) | Ancient Roman, English, German | |
| Jurian | | - | Medieval Low German | |
| Justine | | zhuy-STEEN (French), jus-TEEN (English) | French, English, Dutch, German | |
| Justus | | YUWS-tuws (German), JUS-təs (English) | German, Dutch, Late Roman | |
| Jutta | | - | German | |
| KÄThe | | KE-tə | German | |
| KÖRbl | | KUUR-bəl | German | |
| Kai (1) | | KIE (German, Swedish, Finnish) | Frisian, German, Swedish, Norwegian, Danish, Finnish, Dutch | |
| Karen (1) | | KAH-ren (Danish), KER-ən (English), KAR-ən (English) | Danish, Norwegian, Icelandic, German, English | |
| Karin | | KAH-rin (Swedish, German, Dutch), KAH-reen (Finnish), KER-ən (English), KAR-ən (English) | Swedish, Norwegian, Danish, German, Dutch, Finnish, English | |
| Karina | | kah-REE-nah (Swedish, Polish, German, Russian), kə-REE-nə (English) | Swedish, Danish, Norwegian, Polish, German, Russian, English | |
| Karl | | KAHRL (German, Danish, English, Finnish) | German, Swedish, Norwegian, Danish, English, Finnish, Ancient Germanic | |
| Karla | | KAHR-lah (German) | German, Swedish, Norwegian, Danish, Croatian | |