| Idelle | | ie-DEL | English (Rare) | |
| Ilbert | | - | English (Rare) | |
| Ilean | | ie-LEEN | English (Rare) | |
| Ileen | | ie-LEEN | English (Rare) | |
| Indigo | | IN-di-go | English (Rare) | |
| Inigo | | IN-i-go | English (Rare) | |
| Ipati | | - | Russian (Rare) | |
| Ipatiy | | - | Russian (Rare) | |
| Irma | | EER-mah (German, Finnish), UR-mə (English) | German, English, Dutch, Finnish, Spanish, Italian, Georgian, Lithuanian, Hungarian (Rare), Ancient G | |
| Irmuska | | EER-moosh-kaw | Hungarian (Rare) | |
| Isador | | IZ-a-dawr | English (Rare) | |
| Isbel | | IZ-bel | English (Rare) | |
| Isebella | | iz-ə-BEL-ə | English (Rare) | |
| Isidora | | ee-see-DHO-rah (Spanish), ee-zee-DO-rah (Italian), iz-i-DAWR-ə (English) | Serbian, Macedonian, Spanish, Portuguese, Russian (Rare), Italian (Rare), English (Rare), Ancient Gr | |
| Isolde | | i-ZOL-də (English), i-SOL-də (English), ee-ZAWL-du (German) | English (Rare), German, Arthurian Romance | |