| Irving | Man | English Names |
| Irwin | Man | American Names |
| Iryna | Woman | Slavic Names |
| Isa | Unisex | Arabic Names |
| Isaac | Man | Hebrew Names |
| Isabeau | Woman | French Names |
| Isabel | Woman | Spanish Names |
| Isabella | Woman | Italian Names |
| Isabelle | Woman | French Names |
| Isabelline | Woman | French Names |
| Isabis | Woman | American Names |
| Isadora | Woman | Greek Names |
| Isadore | Man | Greek Names |
| Isai | Man | American Names |
| Isaiah | Man | Hebrew Names |
| Isaias | Man | Latin Names |
| Isako | Woman | Japanese Names |
| Isam | Man | Arabic Names |
| Isamu | Man | Japanese Names |
| Isandro | Woman | Spanish Names |