| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| ISLWYN | - | Welsh | ||
| Ismael | ['ismiəl] | |||
| ISMAEL | - | Spanish, Biblical Greek | ||
| ISMAHEL | - | Biblical Latin | ||
| ISMAIL | - | Arabic, Uyghur | ||
| ISMA'IL | - | Arabic | ||
| ISMENE | - | Greek Mythology | ||
| ISMO | EES-mo | Finnish | ||
| ISOBEL | - | Scottish | ||
| ISOCRATES | - | Ancient Greek (Latinized) | ||
| 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 |