| Inka | | EENG-kah (Finnish), ING-kah (German) | Frisian, Finnish, German | |
| 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 | |
| Iris | | IE-ris (English), EE-ris (German, Dutch), EE-rees (Finnish, Spanish) | Greek Mythology, English, German, Dutch, Swedish, Norwegian, Danish, Finnish, French, Spanish | |
| Irma | | EER-mah (German, Finnish), UR-mə (English) | German, English, Dutch, Finnish, Spanish, Italian, Georgian, Lithuanian, Hungarian (Rare), Ancient G | |
| Irmentrud | | EER-men-troot | German (Archaic) | |
| Irmgard | | EERM-gahrt | German | |
| Irmhild | | EERM-hilt | German | |
| Irmingard | | EER-min-gahrt | German | |
| Irmtraud | | EERM-trowt | German | |
| Irmtrud | | EERM-troot | German | |
| Isa (2) | | EE-sah: (Dutch) | German, Dutch, Italian, Spanish | |
| Isa (3) | | - | Frisian, Ancient Germanic | |
| Isaak | | ee-SAH-ahk (Russian) | Russian, German, Biblical Greek | |
| Isabel | | ee-sah-BEL (Spanish), IZ-ə-bel (English), ee-za-BEL (French), ee-zah-BEL (German) | Spanish, Portuguese, English, French, German | |
| Isabell | | ee-zah-BEL | German | |