| Issac | - | Biblical Name | Issachar | - | Biblical Name |
| Issam | - | Assyrian Name | Issar | - | Muslim Name |
| Isser | - | Yiddish Name | Isserl | - | Yiddish Name |
| Issiah | - | Hebrew Name | Issie | - | Yiddish Name |
| Issur | - | Yiddish Name | Istakhri | - | Muslim Name |
| Istaqa | - | American Name | Istardh | - | Hindu Name |
| Istu | - | American Name | Istvan | - | Hungarian Name |
| Isui | - | Biblical Name | Itang | - | Philippines Name |
| Itche | - | Yiddish Name | Itchl | - | Yiddish Name |
| Ithaar | - | Muslim Name | Ithai | - | Biblical Name |
| Ithamar | - | Biblical Name | Ithamer | - | Phoenician Name |
| Ithavari | - | Hindu Name | Ither | - | Arthurian Name |
| Ithidon | - | Phoenician Name | Ithiel | - | Biblical Name |
| Ithihass | - | Hindu Name | Ithmelqart | - | Phoenician Name |
| Ithobaal | - | Phoenician Name | Ithobaalon | - | Phoenician Name |
| Ithon | - | West Indies Name | Ithran | - | Biblical Name |
| Ithream | - | Biblical Name | Itiel | - | Assyrian Name |
| Itigak | - | Eskimo Name | Itimad | - | Muslim Name |
| Itish | - | Indian Name | Itoua | - | Cameroon Name |
| Itsel | - | Yiddish Name | Itshke | - | Yiddish Name |
| Itshl | - | Yiddish Name | Itsik | - | Yiddish Name |
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