Irena: Name day
Name Day List: Irena
| Country | Day | Month | Names |
 Croatia | 22 | January | Vinko, Irena |
 Lithuania | 5 | April | Irena, Rimvydas, Zenius, Zenonas, Zyginte |
 Poland | 5 | April | Borzywoj, Irena, Wincenty |
 Slovakia | 6 | April | Irena |
 Czechia | 16 | April | Irena |
 Bulgaria | 5 | May | Irina, Mira, Irena, Miroslav, Miroslava |
| Poland | 5 | May | Irena, Ita, Pius, Teodor, Waldemar, Zdzibor |
 Latvia | 13 | May | Ina, Ira, Iraida, Irena, Irene, Irina, Miervalda |
| Croatia | 18 | September | Ivan Macias, J. Kupert., Irena |
| Poland | 18 | September | Dobrowit, Irena, Irma, Józef, Ryszarda, Stefania, Tytus, Zachariasz |
| Poland | 20 | September | Dionizy, Eustachiusz, Eustachy, Fausta, Faustyna, Filipina, Irena, Oleg, Ostap, Sozant |
| Croatia | 20 | October | Vendelin, Irena, Miroslava |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
Name Day List - similar names (Irena)
Austria