| Isui | - | Biblical Name | Ithaar | - | Muslim Name |
| Ithai | - | Biblical Name | Ithamar | - | Biblical Name |
| Ithavari | - | Hindu Name | Ither | - | Arthurian Name |
| Ithiel | - | Biblical Name | Ithihass | - | Hindu Name |
| Ithran | - | Biblical Name | Ithream | - | Biblical Name |
| Itimad | - | Muslim Name | Itish | - | Indian Name |
| Ittah-kazin | - | Biblical Name | Itztli | - | Nahuatl Name |
| Iulian | - | Romanian Name | Ivachha | - | Hindu Name |
| Ivan | - | Romanian Name | IVAN | - | Russian Name |
| Ivantie | - | Romanian Name | Ivar | - | Norse Name |
| Iver | - | Scottish Name | Ives | - | English Name |
| Ivor | - | Norse Name | Ixaka | - | Basque Name |
| Ixidor | - | Basque Name | Iyaad | - | Muslim Name |
| Iyaas | - | Muslim Name | Iye | - | American Name |
| Iyyappan | - | Indian Name | Izaak | - | German Name |
| Izaan | - | Muslim Name | Izaiah | - | Hebrew Name |
| Izak | - | Hebrew Name | Izaya | - | Hebrew Name |
| Izayah | - | American Name | Izehar, Izhar | - | Biblical Name |
| Izhaar | - | Arabic Name | Izhar | - | Indian Name |
| Izmirlian | - | Armenian Name | Izrahiah | - | Biblical Name |
| Izsak | - | Hungarian Name | Izusa | - | American Name |
| Izyan | - | Muslim Name | Izz | - | Muslim Name |
| IZZALDIN | - | Muslim Name | Izzat | - | Muslim Name |
| IZZEDDIN | - | Muslim Name | Jaafar | - | African Name |
| Jaakan | - | Biblical Name |
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