| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Isokrates | - | Ancient Greek | ||
| Isolda | i-ZOL-də (English), i-SOL-də (English) | Arthurian Romance | ||
| Isolde | i-ZOL-də (English), i-SOL-də (English), ee-ZAWL-du (German) | English (Rare), German, Arthurian Romance | ||
| Isotta | ee-ZOT-tah | Italian | ||
| Isra | - | Arabic | ||
| Israa | - | Arabic | ||
| Israel | IZ-ray-əl (English), IZ-ree-əl (English) | Jewish, English, Biblical, Biblical Greek | ||
| Israfil | - | Judeo-Christian Legend | ||
| Israhel | - | Biblical Latin | ||
| Issa | - | Arabic | ||
| Issachar | IS-ə-kahr (English) | Biblical | ||
| IstvÁN | - | Hungarian | ||
| Itala | - | Italian | ||
| Italia | - | Italian | ||
| Italo | - | Italian |