| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| IRVIN | UR-vin | English | ||
| IRVINE | UR-vien, UR-vin | English, Scottish | ||
| Irving | ['ə:viŋ] | |||
| IRVING | UR-ving (English, Scottish) | English, Scottish, Jewish | ||
| Irwin | ['ə:win] | |||
| IRWIN | UR-win | English | ||
| IRYNA | ee-RI-nah | Ukrainian | ||
| Isa | ['aizə] | |||
| ISA (1) | - | Arabic | ||
| ISA (2) | EE-sah: (Dutch) | German, Dutch, Italian, Spanish | ||
| ISA (3) | - | Frisian, Ancient Germanic | ||
| Isaac | ['aaizək] | |||
| ISAAC | IE-zək (English) | English, Jewish, Biblical, Biblical Latin | ||
| ISAAK | ee-SAH-ahk (Russian) | Russian, German, Biblical Greek | ||
| ISAAKU | - | Old Church Slavic |