| Iago | Man | Spanish Names |
| Iban | Woman | Spanish Names |
| Idalia | Woman | Spanish Names |
| Idalis | Woman | Spanish Names |
| Idoya | Woman | Spanish Names |
| Ignacia | Woman | Spanish Names |
| Ignacio | Man | Spanish Names |
| 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 |