| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Isokrates | - | Ancient Greek | ||
| Isolda | i-ZOL-də (English), i-SOL-də (English) | Arthurian Romance | ||
| Isolde | i-ZOL-də (English), i-SOL-də (English), ee-ZAWL-du (German) | English (Rare), German, Arthurian Romance | ||
| Isotta | ee-ZOT-tah | Italian | ||
| Israfil | - | Judeo-Christian Legend | ||
| IstvÁN | - | Hungarian | ||
| Itala | - | Italian | ||
| Italia | - | Italian | ||
| Italo | - | Italian | ||
| Italus | - | Roman Mythology | ||
| Itri | - | Northern African, Berber | ||
| Itsuki | ee-tsoo-kee | Japanese | ||
| Itumeleng | - | Southern African, Tswana | ||
| Itzel | - | Native American, Mayan | ||
| Itziar | - | Basque, Spanish |