| Incenio | Man | Spanish Names |
| Ines | Woman | Spanish Names |
| Inez | Woman | Spanish Names |
| Inocencia | Woman | Spanish Names |
| Irena | Woman | Spanish Names |
| Iria | Woman | Spanish Names |
| Isabel | Woman | Spanish Names |
| Isandro | Woman | Spanish Names |
| Isaura | Woman | Spanish Names |
| Isi | Woman | Spanish Names |
| Isolda | Woman | Spanish Names |
| Isolina | Woman | Spanish Names |
| Ita | Woman | Spanish Names |
| Itzayana | Woman | Spanish Names |
| Iyana | Woman | Spanish Names |
| Jacinta | Woman | Spanish Names |
| Jaime | Unisex | Spanish Names |
| Jairo | Man | Spanish Names |
| Jandina | Woman | Spanish Names |
| Jara | Woman | Spanish Names |