| Ioubal | | - | Biblical Greek | |
| Ioudas | | - | Biblical Greek | |
| Ioudith | | - | Biblical Greek | |
| Iounia | | - | Biblical Greek | |
| Iphigeneia | | - | Greek Mythology | |
| Iphigenia | | - | Greek Mythology (Latinized) | |
| Iraklis | | - | Greek | |
| 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) | |
| Iris | | IE-ris (English), EE-ris (German, Dutch), EE-rees (Finnish, Spanish) | Greek Mythology, English, German, Dutch, Swedish, Norwegian, Danish, Finnish, French, Spanish | |
| Iro | | - | Greek | |
| Isaak | | ee-SAH-ahk (Russian) | Russian, German, Biblical Greek | |
| Isidoros | | - | Ancient Greek | |
| Ismael | | - | Spanish, Biblical Greek | |