| Jannike | | YAHN-ni-ke (Swedish) | Norwegian, Swedish, Danish | |
| Jarl | | YAHRL (Norwegian, Swedish, Danish) | Norwegian, Swedish, Danish, Norse Mythology, Ancient Scandinavian | |
| Jeanette | | zha-NET (French), jə-NET (English), shah-NET (Swedish) | French, English, Danish, Swedish, Norwegian, Dutch | |
| Jennie | | JEN-ee (English) | English, Swedish | |
| Jennifer | | JEN-i-fər (English) | English, German, Dutch, Swedish, Spanish | |
| Jenny | | JEN-ee (English) | English, Swedish, Finnish, German, Dutch, Spanish | |
| Jens | | YENS (Danish) | Danish, Swedish, Norwegian | |
| Jerk | | - | Swedish | |
| Jerker | | - | Swedish | |
| Jessica | | JES-i-kə (English) | English, French, German, Swedish, Norwegian, Danish, Italian, Spanish, Portuguese | |
| Joakim | | YO-ah-kim (Swedish), YO-ah-keem (Finnish) | Swedish, Norwegian, Danish, Finnish, Serbian, Macedonian | |
| Joel | | JOL (English), JO-əl (English), ho-EL (Spanish), zhoo-EL (Portuguese), YO-el (Swedish, Finnish) | English, Spanish, Portuguese, Swedish, Finnish, Biblical | |
| Johan | | YOO-ahn (Swedish) | Swedish, Norwegian, Danish, Dutch | |
| 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 | |