| 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 | |
| Isidoros | | - | Ancient Greek | |
| Isingoma | | - | Eastern African, Ganda | |
| Iskandar | | - | Arabic, Indonesian, Malay | |
| Iskra | | - | Bulgarian, Macedonian, Croatian, Serbian | |
| Isla | | IE-lə | Scottish | |
| Islambek | | - | Chechen | |
| Islay | | IE-lə | Scottish | |
| Ismael | | - | Spanish, Biblical Greek | |
| Ismahel | | - | Biblical Latin | |
| Ismail | | - | Arabic, Uyghur | |
| Isma'il | | - | Arabic | |
| Isobel | | - | Scottish | |
| Isocrates | | - | Ancient Greek (Latinized) | |