| I'tidal | Woman | Arabic Names |
| Iago | Man | Spanish Names |
| Iain | Man | Scottish Names |
| Iakopa | Man | Hawaiian Names |
| Ian | Man | Scottish Names |
| Ianna | Woman | American Names |
| Iantha | Woman | Greek Names |
| Ianthe | Woman | Greek Names |
| Ianto | Man | Welsh Names |
| Iao | Woman | Hawaiian Names |
| Iaolani | Unisex | Hawaiian Names |
| Iara | Woman | Arabic Names |
| Ibai | Man | Basque Names |
| Iban | Woman | Spanish Names |
| Iben | Unisex | Scandinavian Names |
| Ibis | Unisex | Latin Names |
| Ibraheim | Man | Hebrew Names |
| Ibrahim | Man | Arabic Names |
| Ibtesam | Woman | Arabic Names |
| Icarus | Unisex | Greek Names |