Ilja: Name day
Name Day List: Ilja
Name Day List - similar names (Ilja)
| Country | Day | Month | Names |
 Croatia | 19 | January | Mario, Ljiljana, Marta |
 Estonia | 27 | January | Vilja, Vilje |
| Croatia | 14 | March | Matilda, Miljana, Borka |
| Croatia | 16 | March | Hrvoje, Miljan |
 Finland | 6 | April | Ville, Vilho, Viljami, Jami, Vilhelm, Vili |
| Estonia | 19 | May | Emilie, Emma, Miili, Milja, Milla, Milli |
| Finland | 19 | May | Emilia, Emma, Mila, Milena, Amalia, Emmi, Milja, Milka, Milla, Amelia |
| Estonia | 20 | May | Liilia, Lilian, Liili, Lille, Lilli, Lilja |
| Finland | 20 | May | Lilian, Lilja, Karoliina, Lila, Lili, Lilli, Lilia |
| Estonia | 5 | June | Viljar, Viljer, Viljo, Vilju, Vilimo |
| Croatia | 28 | June | Irenej, Smiljan |
| Estonia | 7 | August | Vaido, Vaigo, Vaiko, Hiljar, Hiljo |
| Finland | 12 | September | Valma, Vilja, Neo |
| Estonia | 8 | October | Hilja, Hilje, Hilju |
| Finland | 8 | October | Hilja |
| Estonia | 22 | November | Cecilia, Säsil, Silja, Silje, Sille |
| Finland | 22 | November | Selja, Silja, Seela, Cecilia |
Czechia 
Slovakia