| Jan (1) | | YAHN (Dutch, Swedish, Norwegian, Polish, German) | Dutch, Swedish, Norwegian, Danish, Czech, Polish, Slovene, German, Catalan | |
| Janne (2) | | - | Danish, Norwegian | |
| Jannick | | - | Danish | |
| Jannicke | | YAHN-nik-ke (Swedish) | Norwegian, Swedish, Danish | |
| Jannik | | - | Danish | |
| 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 | |
| Jens | | YENS (Danish) | Danish, Swedish, Norwegian | |
| Jeppe | | - | Danish | |
| Jerrik | | - | Danish | |
| Jesper | | YES-pər | Danish | |
| 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 | |
| Johan | | YOO-ahn (Swedish) | Swedish, Norwegian, Danish, Dutch | |