| 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 | |
| Isabel | | ee-sah-BEL (Spanish), IZ-ə-bel (English), ee-za-BEL (French), ee-zah-BEL (German) | Spanish, Portuguese, English, French, German | |
| Isabela | | ee-sah-BEL-ah (Spanish) | Spanish, Portuguese, Romanian | |
| Isaura | | ee-SOW-rah (Spanish) | Portuguese, Spanish, Late Roman | |
| Isidora | | ee-see-DHO-rah (Spanish), ee-zee-DO-rah (Italian), iz-i-DAWR-ə (English) | Serbian, Macedonian, Spanish, Portuguese, Russian (Rare), Italian (Rare), English (Rare), Ancient Gr | |
| Isidoro | | ee-see-DHO-ro (Spanish), ee-zee-DO-ro (Italian) | Spanish, Italian | |
| Isidro | | - | Spanish | |
| Ismael | | - | Spanish, Biblical Greek | |
| Itziar | | - | Basque, Spanish | |
| IvÁN | | - | Spanish, Hungarian | |
| Ivette | | - | Spanish | |
| Ivonne | | ee-VAWN (German) | Spanish, German, Dutch | |
| Jacinta | | hah-THEEN-tah (Spanish), hah-SEEN-tah (Latin American Spanish) | Spanish, Portuguese | |