| Iokina | Woman | Hawaiian Names |
| Iokua | Man | Hawaiian Names |
| Iola | Woman | Greek Names |
| Iolana | Woman | Hawaiian Names |
| Iolani | Unisex | Hawaiian Names |
| Iolanthe | Woman | Greek Names |
| Iolo | Man | Welsh Names |
| Ion | Man | Russian Names |
| Iona | Woman | Scottish Names |
| Ione | Woman | Greek Names |
| Ionut | Man | Romansh Names |
| Iorwen | Woman | Welsh Names |
| Iorwerth | Man | Welsh Names |
| Ioviano | Man | Native American - Cheyenne Names |
| Iowa | Woman | Native American Names |
| Iphigenia | Woman | Greek Names |
| Iphigenie | Woman | French Names |
| Ipo | Unisex | Hawaiian Names |
| Iqbal | Man | Arabic Names |
| Ira | Unisex | Hebrew Names |