| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Iason | - | Greek Mythology, Ancient Greek, Greek, Biblical Greek, Biblical Latin | ||
| Irenaeus | - | Ancient Greek (Latinized) | ||
| Irene | ie-REEN (English), ie-REE-nee (English), ee-RE-ne (Italian), EE-re-ne (Finnish), ee-RE-nu (German) | English, Italian, Spanish, Portuguese, Swedish, Norwegian, Danish, Finnish, German, Ancient Greek (L | ||
| Ireneus | - | Ancient Greek (Latinized) | ||
| Isidoros | - | Ancient Greek | ||
| Isocrates | - | Ancient Greek (Latinized) | ||
| Isokrates | - | Ancient Greek |