Irén's name day is celebrated on March 25 and June 28 in Hungary.
The name Irén is rarely seen in the general population of the USA, often indicating a connection to Hungarian or European ancestry. Its origin is shared with Irene, tracing back to ancient roots related to peace. In terms of tone, Irén projects a mood of quiet elegance and gentle sophistication. Globally, the name is strictly classified as female. While not common in American naming trends, it stands out due to its distinct sound and heritage.
| Country | Day | Month | Names |
 Croatia | 22 | January | Vinko, Irena |
 Spain | 21 | February | Irene, Pedro Damián |
 Poland | 25 | March | Dyzma, Ireneusz, Lucja, Łucja, Lutomysł, Maria, Mariola, Wieńczysław |
 Austria | 1 | April | Hugo, Irene, Irina |
 Italy | 1 | April | Irene |
 Germany | 3 | April | Irene |
 Denmark | 5 | April | Irene |
 Estonia | 5 | April | Irene, Ireene, Reene, Reena, Rena, Renate |
 Finland | 5 | April | Irene, Irina, Ira, Iro |
 France | 5 | April | Irène |
 Lithuania | 5 | April | Irena, Rimvydas, Zenius, Zenonas, Zyginte |
 Norway | 5 | April | Eiril, Eirin, Irene |
| Poland | 5 | April | Borzywoj, Irena, Wincenty |
 Sweden | 5 | April | Irene, Irja |
 USA | 5 | April | Chandra, Ethelburga, Irene, Irina, Tyler, Tylor |
| Poland | 6 | April | Ada, Adam, Adamina, Celestyn, Celestyna, Diogenes, Ireneusz, Katarzyna, Świętobor, Sykstus, Wilhelm, Zachariasz |
 Slovakia | 6 | April | Irena |
 Czechia | 16 | April | Irena |
 Ukraine | 16 | April | Irene, Oryna, Orysia |
 Greece | 26 | April | Glafyra, Irene |
 Bulgaria | 5 | May | Irina, Mira, Irena, Miroslav, Miroslava |
| Greece | 5 | May | Eirinis, Irini, Irene, Efraim |
| Poland | 5 | May | Irena, Ita, Pius, Teodor, Waldemar, Zdzibor |
| Ukraine | 5 | May | Myroslav, Myroslava, Irene |
 Latvia | 13 | May | Ina, Ira, Iraida, Irena, Irene, Irina, Miervalda |
| Norway | 16 | May | Sara, Siren |
| Austria | 28 | June | Ekkehard, Harald, Irenäus |
| Croatia | 28 | June | Irenej, Smiljan |
| France | 28 | June | Irénée |
| Italy | 28 | June | Ireneo |
| Poland | 28 | June | Amos, Ireneusz, Józef, Leon, Paweł, Raissa, Zbrosław |
| Lithuania | 17 | July | Aleksas, Darius, Girenas, Vaiga |
| Greece | 28 | July | Afhentios, Timon, Irene |
| Denmark | 26 | August | Irenæus |
| Croatia | 18 | September | Ivan Macias, J. Kupert., Irena |
| Poland | 18 | September | Dobrowit, Irena, Irma, Józef, Ryszarda, Stefania, Tytus, Zachariasz |
| Ukraine | 18 | September | Irene |
| Poland | 20 | September | Dionizy, Eustachiusz, Eustachy, Fausta, Faustyna, Filipina, Irena, Oleg, Ostap, Sozant |
| Croatia | 20 | October | Vendelin, Irena, Miroslava |
| Italy | 20 | October | Irene del Portogallo |
| Poland | 20 | October | Budzisława, Irena, Jan Kanty, Kleopatra, Wendelin, Witalis |
| Spain | 20 | October | Academia, Irene |
| Croatia | 14 | December | Irenej, Drinske mucenice |
| Lithuania | 21 | December | Girene, Honoratas, Norgaudas, Tomas |
Hungary