| IrÈNe | | ee-REN | French | |
| Ira (1) | | IE-rə (English) | Biblical, English, Hebrew | |
| Ireland | | IER-lənd | English (Modern) | |
| Irena | | ee-RE-nah (Polish), ee-RAY-nah (Dutch) | Polish, Czech, Slovene, Croatian, Serbian, Dutch, Lithuanian | |
| 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 | |
| Irma | | EER-mah (German, Finnish), UR-mə (English) | German, English, Dutch, Finnish, Spanish, Italian, Georgian, Lithuanian, Hungarian (Rare), Ancient G | |
| Irvin | | UR-vin | English | |
| Irvine | | UR-vien, UR-vin | English, Scottish | |
| Irving | | UR-ving (English, Scottish) | English, Scottish, Jewish | |
| Irwin | | UR-win | English | |
| Isa (3) | | - | Frisian, Ancient Germanic | |
| Isaac | | IE-zək (English) | English, Jewish, Biblical, Biblical Latin | |