| Janine | | zha-NEEN (French), jə-NEEN (English) | French, English, Dutch, German | |
| Jasmin (1) | | YAHS-meen (German), JAZ-min (English) | German, English | |
| Jennifer | | JEN-i-fər (English) | English, German, Dutch, Swedish, Spanish | |
| Jenny | | JEN-ee (English) | English, Swedish, Finnish, German, Dutch, Spanish | |
| Jeremias | | ye-re-MEE-ahs (German), YE-re-mee-ahs (Finnish) | German, Portuguese, Finnish | |
| Jessica | | JES-i-kə (English) | English, French, German, Swedish, Norwegian, Danish, Italian, Spanish, Portuguese | |
| Jessika | | YE-si-kah (German), JES-i-kə (English) | German, English (Modern) | |
| Jo | | JO (English) | English, German, Dutch | |
| Joachim | | zho-a-KEEM (French), YO-ah-khim (German), yo-AH-khim (German), yaw-AH-kheem (Polish), JO-ə-kim (English) | French, German, Polish, Judeo-Christian Legend | |
| Jochen | | YO-khen | German | |
| Jochim | | YO-khim | German | |
| Jockel | | - | German | |
| Johann | | YO-hahn | German | |
| Johanna | | yo-HAH-nah (German), yo-HAHN-nah (Danish, Dutch), YO-hahn-nah (Finnish) | German, Swedish, Norwegian, Danish, Dutch, Hungarian, Finnish, Estonian, English, Late Roman | |
| Johannes | | yo-HAH-nes (German), yo-HAHN-nəs (Dutch, Danish), YO-hahn-nes (Finnish) | German, Dutch, Swedish, Norwegian, Danish, Finnish, Estonian, Late Roman | |