| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Isaiah | ie-ZAY-ə (English), ie-ZIE-ə (English) | English, Jewish, Biblical | ||
| Isaias | - | Biblical | ||
| Isaija | - | Serbian, Macedonian | ||
| Isaure | - | French | ||
| Isbrand | - | Ancient Germanic | ||
| Iscah | - | Biblical | ||
| Iseabail | - | Scottish | ||
| Iseult | i-SOOLT (English), i-ZOOLT (English), EE-səlt (English) | Arthurian Romance | ||
| Ishbel | - | Scottish | ||
| Ishild | - | Ancient Germanic (Hypothetical) | ||
| Ishmael | ISH-may-əl (English), ISH-mee-əl (English) | Biblical | ||
| Ishmerai | - | Biblical | ||
| Ishvi | - | Biblical | ||
| Isi | - | Native American, Choctaw | ||
| Isidor | EE-see-dawr (German) | German, Russian, Macedonian |