| Inori | Woman | Japanese Names |
| Isako | Woman | Japanese Names |
| Isamu | Man | Japanese Names |
| Isano | Woman | Japanese Names |
| Isaye | Woman | Japanese Names |
| Ishiko | Woman | Japanese Names |
| Isoko | Woman | Japanese Names |
| Isono | Woman | Japanese Names |
| Itachi | Man | Japanese Names |
| Itsuki | Man | Japanese Names |
| Itsuko | Woman | Japanese Names |
| Itsuo | Man | Japanese Names |
| Iwao | Man | Japanese Names |
| Izumi | Woman | Japanese Names |
| Jin | Unisex | Japanese Names |
| Jiro | Man | Japanese Names |
| Jirou | Man | Japanese Names |
| Joji | Man | Japanese Names |
| Junko | Woman | Japanese Names |
| Junpei | Man | Japanese Names |