| Name | Date | Month | Icon | Bios |
| IAKHOS (Iakhos) | 17 | December | | |
| IAMOS (Iamos) | 0 | not known | | |
| IAMVLIHOS (Iamvlihos) | 0 | not known | | |
| IANOS (Janos, Janus, Ianos, Gennadi, Gennaro, Janan, Janiusz, Januarius, Janusz, Jenaro, Jenarius, Jennaro) | 21 | April |  |  |
| IAPETOS (Iapetos) | 0 | not known | | |
| IASIMOS (Iasimos) | 4 | February | | |
| IASION (Iasion) | 0 | not known | | |
| IASO (Iaso) | 0 | not known | | |
| ICONIA (Iconia, Eikonia) | 0 | not known | | |
| IDAIA (Idaia) | 0 | not known | | |
| IDAIOS (Idaios) | 0 | not known | | |
| IDILI (Idelle, Hedili, Idella) | 0 | not known | | |
| IDOMENEFS (Idomenefs, Idomeneas) | 0 | not known | | |
| IERAX (Ierax) | 1 | June | | |
| IERIA (Ieria) | 3 | June | | |
| IEROKLIS (Ieroklis) | 0 | not known | | |
| IERONYMOS (Ieronymos, Jeronymo) | 15 | June | | |
| IEROTHEOS (Ierotheos) | 4 | October | | |
| IETION (Ietion) | 0 | not known | | |
| IFAISTOS (Ifaistos) | 0 | not known | | |
| IFESTION (Ifestion) | 10 | April | | |
| IFIGENIA (Ifigenia, Efigenia, Ephigenia) | 16 | November |  |  |
| IFIKRATEIA (Ifikrateia) | 0 | not known | | |
| IFIKRATIS (Ifikratis) | 0 | not known | | |
| IFITOS (Ifitos) | 0 | not known | | |
| IGELOHOS (Igelohos) | 0 | not known | | |
| IGIAS (Igias) | 0 | not known | | |
| IGIMON (Igimon) | 0 | not known | | |
| IGISANDROS (Igisandros) | 0 | not known | | |
| IGISIANAX (Igisianax) | 0 | not known | | |
| IGISIAS (Igisias) | 0 | not known | | |
| IGISIPPOS (Igisippos) | 0 | not known | | |
| IGITOR (Igitor) | 0 | not known | | |
| IGNATIOS (1) (Ignatios) | 14 | October |  |  |
| IGNATIOS (2) (Ignatios) | 20 | December |  |  |
| IHO (Iho, Echo) | 0 | not known | | |
| IKARIOS (Ikarios) | 0 | not known | | |
| IKELIDAS (Ikelidas) | 0 | not known | | |
| IKETAS (Iketas) | 0 | not known | | |
| IKTINOS (Iktinos) | 0 | not known | | |
|
|
| ILARION (Ilarion, Ilarionas, Ilaria, Ilariada, Lariada) | 6 | June | | |
| ILEKTRA (Ilektra, Electra) | 0 | not known | | |
| ILEKTRION (Ilektrion, Electrion) | 0 | not known | | |
| ILIANA (Iliana, Ilias) | 9 | March | | |
| ILIAS (Ilias, Iliada) | 0 | not known | | |
| ILIODOROS (Iliodoros, Iliodora, Heliodora, Eldora, Eleadora, Eleodora, Elda) | 20 | August | | |
| ILIOFOTOS (Heliofotos) | 13 | July | | |
| ILIONI (Ilioni, Helioni) | 0 | not known | | |
| ILIOS (Ilios, Helios) | 0 | not known | | |
| ILLOS (Illos, Helos) | 0 | not known | | |
| ILLYRIOS (Illyrios) | 3 | April | | |
| IMVRIOS (Imvrios) | 0 | not known | | |
| INAHOS (Inahos) | 0 | not known | | |
| INIOHOS (Iniohos) | 0 | not known | | |
| INO (Ino) | 0 | not known | | |
| IO (Io) | 0 | not known | | |
| IO (Io) | 0 | not known | | |
| IOANIKIOS (Ioannikios) | 4 | November | | |
| IOANNIS ROSSOS (Ioannis Rossos) | 27 | May | | |
| IOKASTI (Iokasti) | 0 | not known | | |
| IOLI (Ioli) | 0 | not known | | |
| IOLKIOS (Iolkios) | 0 | not known | | |
| IOLLAS (Iollas) | 0 | not known | | |
| IONI (Ioni) | 0 | not known | | |
| IOUBENALIOS (Ioubenalios, Jouvenalious) | 13 | December | | |
| IOULIANOS (Ioulianos, Joulian) | 16 | March | | |
| IOUSTA (Iousta, Jousta) | 2 | October | | |
| IOV (*) (2) (Iov, Job, Iovia, Iobia, Jobia, Jovia, Iovi, Iobi) | 14 | December |  |  |
| IOV (1) (Iov, Job, Iovia, Iobia, Jobia, Jovia, Iovi, Iobi) | 6 | May |  |  |
| IOVATIS (Iovatis) | 0 | not known | | |
| IPAPANTI (Ypapante, Ypapanti) | 2 | February | | |
| IPIONI (Ipioni) | 0 | not known | | |
| IPOMONI (Ypomoni) | 29 | May |  |  |
| IPPARHOS (Ipparhos) | 0 | not known | | |
| IPPI (Ippi) | 0 | not known | | |
| IPPIAS (Ippias) | 0 | not known | | |
| IPPODAMEIA (Ippodameia) | 0 | not known | | |
| IPPOKRATIS (Ippokratis) | 0 | not known | | |
| IPPOLYTOS (Ippolytos) | 10 | August | | |
| IPPON (Ippon) | 0 | not known | | |
|
|
| IPPOSTHENIS (Ipposthenis) | 0 | not known | | |
| IRA (Ira, Hera) | 0 | not known | | |
| IRAKLEIDIS (Irakleidis, Heraklidis) | 0 | not known | | |
| IRAKLEITOS (Irakleitos, Heraklitos) | 0 | not known | | |
| IREAS (Ireas) | 0 | not known | | |
| IRIGONI (Irigoni) | 0 | not known | | |
| IRILLOS (Irillos) | 0 | not known | | |
| IRINARHOS (Eirenarhos, Irenarhos, Irinarhos) | 28 | November | | |
| IRINI (*) (3) (Eirene, Eirini, Irene, Irini, Rene, Rena, Renia, Rhenia) | 22 | April |  |  |
| IRINI (1) (Eirene, Eirini, Irene, Irini, Rene, Rena, Renia, Rhenia) | 5 | May |  |  |
| IRINI (2) (Eirene, Eirini, Irene, Irini) | 28 | July |  |  |
| IRINNA (Irinna) | 0 | not known | | |
| IRIS (Iris, Irida, Irais, Iraida, Rhais) | 23 | September |  |  |
| IRO (Iro, Hero) | 10 | August | | |
| IRODION (Rodion, Herodion, Herodias, Herodiada) | 10 | November |  |  |
| IRODOROS (Irodoros) | 0 | not known | | |
| IRODOTOS (Irodotos) | 0 | not known | | |
| IROFILI (Irofili) | 0 | not known | | |
| IROFILOS (Irofilos) | 0 | not known | | |
| IRON (Iron, Heron) | 10 | August | | |
| ISAAC (*) (Isaac) | 14 | December |  |  |
| ISAIOS (Isaios) | 0 | not known | | |
| ISANDROS (Isandros) | 0 | not known | | |
| ISAVELLA (Isavella) | 0 | not known | | |
| ISIDORA (Isidora, Dora) | 1 | May |  |  |
| ISIDOROS (1) (Isidoros) | 4 | February | | |
| ISIDOROS (2) (Isidoros) | 14 | May | | |
| ISIODOS (Isiodos) | 0 | not known | | |
| ISIONI (Isioni) | 0 | not known | | |
| ISMAIL (Ismail) | 17 | June | | |
| ISMENE (Jasmin, Yasmin, Jasmeen, Yasmeen, Ismini) | 1 | September | | |
| ISOCRATES (Isocratis) | 10 | April |  |  |
| ISTHMIONIKIS (Isthmionikis) | 0 | not known | | |
| ISTROS (Istros) | 0 | not known | | |
| ISYHIOS (Isyhios) | 6 | March | | |
| ITHAKOS (Ithakos) | 0 | not known | | |
| ITHYKLIS (Ithyklis) | 0 | not known | | |
| ITI (Iti) | 0 | not known | | |
| ITYS (Itys) | 0 | not known | | |
| IVI (Ivi) | 0 | not known | | |
|
|
| IVYKOS (Ivykos) | 0 | not known | | |
| IXION (Ixion) | 0 | not known | | |
| IXIONI (Ixioni) | 0 | not known | | |