| Name | Date | Month | Icon | Bios |
|---|
| JACOB (Jacob) | 1 | December | | |
| JACOB (1) (Iakovos, Giacomo, Mino, Jacob, Jacques, Jaquet, Jacqueline, Jacquiline, James, Jemmy, Janie, Jakob, Jackel, Jockel, Jacky) | 23 | October |  |  |
| JACOB (2) (Iakovos, Giacomo, Mino, Jacob, Jacques, Jaquet, Jacqueline, Jacquiline, James, Jemmy, Janie, Jakob, Jackel, Jockel, Jacky) | 30 | April | | |
| JANE (Jane, Jennifer) | 24 | December | | |
| JANUARY (January, Ianouarios) | 21 | April | | |
| JASON (Iason, Jason, Iasonas) | 29 | April | | |
| JEANNETTE (Jeannette, Jean, Zannetos) | 7 | January | | |
| JEREMIA (Ieremia) | 1 | May | | |
| JOAHIM (Ioakeim) | 9 | September | | |
| JOHN (Ioanna, Ioannis, Ivana, Vana, Vanna) | 7 | January | | |
| JONAS (Jonas, Ionas, Ion) | 4 | July | | |
| JONAS (Jonas, Ionas, Ion) | 21 | September | | |
| JORDAN (Iordanis) | 6 | January | | |
| JOSEF (1) (Iosif, Sifis) | 26 | December | | |
| JOSEF (2) (Iosif, Sifis) | 9 | April | | |
| JOSEF (3) (Iosif, Sifis) | 31 | July | | |
| JOSEF (4) (Iosif, Sifis) | 30 | December | | |
| JOSHUA (Joshua, Jesus of Navi) | 1 | September | | |
| JULIA (1) (Ioulia, Julia, Jule, Julie) | 18 | May | | |
| JULIA (2) (Juliana, Iouliani, Ioulia, Julia, Jule, Julie, Jouliani) | 21 | December | | |
| JULITTA (Ioulitta) | 15 | July | | |
| JUNIA (Iounia) | 17 | May | | |
| JUSTINE (Justine, Ioustini) | 2 | October | | |
| JUSTINE (Justine, Ioustinos) | 1 | June | | |
| JUSTINIANOS (Justinianos) | 2 | August | | |
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