| Iset | | - | Egyptian Mythology | |
| Iseul | | - | Korean | |
| Iseult | | i-SOOLT (English), i-ZOOLT (English), EE-səlt (English) | Arthurian Romance | |
| Isha | | - | Indian, Hindi, Marathi, Hinduism | |
| Ishani | | - | Indian, Hindi | |
| Ishild | | - | Ancient Germanic (Hypothetical) | |
| Ishita | | - | Indian, Hindi | |
| Isi | | - | Native American, Choctaw | |
| Isidor | | EE-see-dawr (German) | German, Russian, Macedonian | |
| 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 | |
| Isidore | | IZ-i-dawr (English), ee-zee-DOR (French) | English, French, Georgian, Jewish | |
| Isidoro | | ee-see-DHO-ro (Spanish), ee-zee-DO-ro (Italian) | Spanish, Italian | |
| Isidoros | | - | Ancient Greek | |
| Isidorus | | - | Late Roman | |
| Isidro | | - | Spanish | |