| 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 | |
| ISINGOMA | | - | Eastern African, Ganda | |
| Isis | | ['aisis] | | |
| ISIS | | IE-sis (English) | Egyptian Mythology (Hellenized) | |
| ISKANDAR | | - | Arabic, Indonesian, Malay | |
| ISKRA | | - | Bulgarian, Macedonian, Croatian, Serbian | |
| ISLA | | IE-lə | Scottish | |
| ISLAMBEK | | - | Chechen | |
| ISLAY | | IE-lə | Scottish | |