| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Jackin | - | Medieval English | ||
| Jan (3) | - | Medieval English | ||
| Jankin | - | Medieval English | ||
| Jehan | - | Medieval French | ||
| Jehanne | - | Medieval French | ||
| Jocosa | - | Medieval English | ||
| Johanne | zho-AN (French), yo-HAHN-ne (Danish) | French, Danish, Norwegian, Medieval French | ||
| Josse | - | French (Rare), Medieval French | ||
| Judd | JUD (English) | English, Medieval English | ||
| Jurian | - | Medieval Low German |