| Ilmatar | | - | Finnish Mythology | |
| Ilona | | EE-lo-naw (Hungarian), ee-LO-nah (German), EE-lo-nah (Finnish) | Hungarian, German, Finnish, Latvian, Lithuanian, Polish, Czech | |
| Ilta | | EEL-tah | Finnish | |
| Impi | | EEM-pee | Finnish | |
| Inka | | EENG-kah (Finnish), ING-kah (German) | Frisian, Finnish, German | |
| Inkeri | | EENG-ke-ree | Finnish | |
| Into | | EEN-to | Finnish | |
| 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 | |
| Irina | | ee-REE-nah (Russian), EE-ree-nah (Finnish) | Russian, Bulgarian, Macedonian, Romanian, Finnish, Georgian | |
| Iris | | IE-ris (English), EE-ris (German, Dutch), EE-rees (Finnish, Spanish) | Greek Mythology, English, German, Dutch, Swedish, Norwegian, Danish, Finnish, French, Spanish | |
| Irja | | EER-yah | Finnish | |
| Irma | | EER-mah (German, Finnish), UR-mə (English) | German, English, Dutch, Finnish, Spanish, Italian, Georgian, Lithuanian, Hungarian (Rare), Ancient G | |
| Ismo | | EES-mo | Finnish | |
| Jaakkima | | YAH:K-kee-mah | Finnish | |
| Jaakko | | YAH:K-ko | Finnish | |