| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Inigo | IN-i-go | English (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 | ||
| Ivonette | - | English (Rare) | ||
| Jacinda | - | English (Rare) | ||
| Jacinth | JAY-sinth, JAS-inth | English (Rare) | ||
| Jackalyn | - | English (Rare) | ||
| Jae | JAY | English (Rare) | ||
| Jaki | JAK-ee | English (Rare) | ||
| Jakki | JAK-ee | English (Rare) | ||
| Jancis | JAN-sis | English (Rare) | ||
| Janeka | - | English (Rare) |