| Iskra | Woman | Slavic Names |
| Isla | Woman | Scottish Names |
| Isleen | Woman | Irish Names |
| Isley | Unisex | English Names |
| Islwyn | Man | Welsh Names |
| Ismael | Man | Hebrew Names |
| Ismaela | Woman | Hebrew Names |
| Ismail | Man | Arabic Names |
| Ismene | Woman | Greek Names |
| Ismet | Man | Turkish Names |
| Isoard | Man | German Names |
| Isoke | Woman | African Names |
| Isoko | Woman | Japanese Names |
| Isolda | Woman | Spanish Names |
| Isolde | Woman | German Names |
| Isolina | Woman | Spanish Names |
| Isondo | Woman | African - Nguni Names |
| Isono | Woman | Japanese Names |
| Isotta | Woman | Italian Names |
| Isqesis | Woman | Native American - Cree Names |