| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Israel | IZ-ray-əl (English), IZ-ree-əl (English) | Jewish, English, Biblical, Biblical Greek | ||
| Issac | IE-zək | English | ||
| Issy | - | English | ||
| Ivonette | - | English (Rare) | ||
| Ivor | IE-vawr (English), EE-vawr (English) | Irish, Scottish, Welsh, English (British) | ||
| Ivy | IE-vee | English | ||
| Izabelle | IZ-ə-bel | English (Modern) | ||
| Izzy | IZ-ee | English | ||
| Jace | JAYS | English | ||
| Jaci | - | English | ||
| Jacinda | - | English (Rare) | ||
| Jacinth | JAY-sinth, JAS-inth | English (Rare) | ||
| Jack | JAK | English | ||
| Jackalyn | - | English (Rare) | ||
| Jacki | JAK-ee | English |