| Ida | | IE-də (English), EE-dah (German, Swedish, Danish, Dutch, Italian) | English, German, Swedish, Norwegian, Danish, Dutch, Italian, Spanish, Portuguese, Hungarian, Slovene | |
| Idoya | | ee-DHOI-ah | Spanish | |
| Ignacia | | eeg-NAH-thyah (Spanish), eeg-NAH-syah (Latin American Spanish) | Spanish | |
| Ignacio | | eeg-NAH-thyo (Spanish), eeg-NAH-syo (Latin American Spanish) | Spanish | |
| Ildefonso | | - | Spanish | |
| Ileana | | - | Romanian, Spanish, Italian | |
| Imelda | | ee-MEL-dah | Italian, Spanish | |
| InÉS | | ee-NES | Spanish | |
| Inma | | - | Spanish | |
| Inmaculada | | - | Spanish | |
| Inocencio | | ee-no-THEN-thyo (Spanish), ee-no-SEN-syo (Latin American Spanish) | Spanish | |
| 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 | |
| Isa (2) | | EE-sah: (Dutch) | German, Dutch, Italian, Spanish | |