| Irene | Woman | Greek Names |
| Irida | Woman | Greek Names |
| Iris | Woman | Greek Names |
| Isadora | Woman | Greek Names |
| Isadore | Man | Greek Names |
| Isidore | Man | Greek Names |
| Ismene | Woman | Greek Names |
| Issoria | Woman | Greek Names |
| Ithaca | Unisex | Greek Names |
| Jacinth | Woman | Greek Names |
| Jaeson | Man | Greek Names |
| Jairus | Man | Greek Names |
| Jason | Man | Greek Names |
| Jericho | Man | Greek Names |
| Jesus | Man | Greek Names |
| Jocasta | Woman | Greek Names |
| Judas | Man | Greek Names |
| Kacia | Woman | Greek Names |
| Kaira | Woman | Greek Names |
| Kairos | Man | Greek Names |