Sort: name | alias
| Jacobus Locard | Seamus (of Nahrun Kabirun) |
| Jacques Lambert | Jean Lambert |
| Jadi Fatima al-Ishfahani al-Samarkandiyya | Jadi Fatima Jalut alish Fahani al-Samar Kandiyya |
| Jael Esson | Deorsa Esson |
| Jael Esson | Issan |
| Jaffrezian de Montcorbier | Daniel of Longstocking |
| James Alagarto of Duckford | Mad James |
| James David of Argentias | James David of Argens |
| James David of Argentias | James David of Argentium |
| James Dubh MacPhearson | Haggis |
| James Eldon of York | Eldon Burgess of York |
| James of Plattefordham | Odoyakana Ryu |
| James of Plattefordham | Minamoto Ryuutarou |
| James of Plattefordham | Minamoto Ryuutarou Kazunori |
| Jameson MacTyre | Jimmie Horn of Thunder |
| Jameson MacTyre | Jameson Mac Tire |
| Jamil ibn Shamir ibn Da\'ud ibn Shamir al-Wadi | Jamil ibn Samir ibn Da-ud al`Wadi |
| Jamila al-Zuhayriyya | Jamethiel (of the Citadel) |
| Jane Gude of Wylshire | Jane “the Good” of Wiltshire |
| Jane Nora Carrik | Jean Nora cu Carrick |
| Jane Nora Carrik | Generica McKenna |
| Janosi Álmos | Malcolm MacCulloch |
| Jantien van Vranckenvoert | Jentien Van der Roet |
| Jarek of Wolin | Jarek af Wolin |
| Jarek of Wolin | Elidir o Morgannwg |
| Jasper Sleecht | Giudo di Niccolo Brunelleschi |
| Jasper Sleecht | Jibril ibn Najdah ibn Zayd al-\'Attar |
| Jasper Sleecht | Jibra\'il `Attar |
| Jasper Sleecht | Jibrail Attar |
| Jasper Sleecht | |
| Jayne Barber | Barbara |
| Jazlynne Marie Fairday | Jazlynne Natalia Romani |
| Jeanette Delacroix | Jeannette de Vallier |
| Jehannete la Picarde | Heather of Caerthe |
| Jehannete la Picarde | Jehannete de Limoux |
| Jehennette van Mynden | Jeannette (of Ravenhyrst) |
| Jehennette van Mynden | Jamie of Eskalya |
| Jehennette van Mynden | Jyne McKegan |
| Jenna al-Ghazaliyyah | Jannah al-Ghazaliyya |
| Jenna al-Ghazaliyyah | Jennah an-Nur al-Ghabi |
| Jethro Stille | Jethro Taylfar |
| Jethro Stille | Suleiman ibn Da’ud ibn Sahl al-Qalqashandi |
| Joaquin Cortez de Castile | Joaquin Alvarez de Castile |
| Joel DeGrace | Excel Trollscap |
| Johann Winter | Johan Winter |
| Johanna bat Ephraim ben Rialah | Johanna of Mercia |
| Johanna Morganstern | Johanna Brillingstern von Scotia |
| Johanna Morganstern | Joanna vom Brilligstern |
| Johannes Adelbart von Pels | Johannes der Kruger von Pelskneipe |
| Johannes Rodenwerper | Johannes Matlock |
| John Wryght | Russell (of Nahrun) |
| Jolno Walehtelia | Talespinner (of Caerthe) |
| Jon Blackwell | Govanen |
| Jörgen Jörgenson | Ja Jorgenson |
| Jórhildr skáldhrafn | Quillon (of al-Barran) |
| Jórhildr skáldhrafn | Jorhildr Hrafnskald Cuileann |
| Jörundr inn magri | Jorundr inn magri |
| Jorundr Sylfuson | Jordan Loch |
| Jorundr Sylfuson | Jordan van Dale |
| Jose Taberna de Torquemada | Torgoth |
| Jose Taberna de Torquemada | Jose of al-Barran |
| Josefina de Luna | Josephina Gitano |
| Joseph Cameron Blackswan | Cameron Blackswan |
| Joseph Grimm | Luke (of Fontaine) |
| Joseph Grimm | Ioseph Grimm |
| Joseph the Hun | Mabus |
| Joshua Dennesson | Josh of Fontaine |
| Joshua Yoisha Shmoel ben Chein | Joshua ben Chaim |
| Jourdain Belebouche | Bubba Ianson |
| Jourdain Belebouche | Bubba of the Southern Shores |
| Juan Balthazar Tegero | Balthazar |
| Juan Osorio de Segovia | Juan de Oso |
| Juana de Granada | Josefina del Castillo |
| Juliana de Vitri | Juliana de Vitre |
| Juliana de Vitri | Juliana de Vitre |
| Julianne Journé | Juliana Journey |
| Julianne Journé | Juilianne de Journey |
| Jürgen Grünwald | Jurgen Gruenwald |
| Justin de Leon | Justin Morgan DeBracie |
| Justin de Leon | Diego Benedicto Gustavo Juarez |
| Justin de Leon | Justin de Bracie |
| Justinian de Quéry | Justinian la Chef de cuisine |
| Justinian the Gentle | Justin of Unser Hafen |