Iro's name day is April 5 in Finland.
Iro is a relatively uncommon name in the United States, but it enjoys more recognition in Finland and Greece, where it’s a traditional given name. Originating from the Greek word 'heiros' meaning 'sacred', it carries connotations of peace and tranquility. The name is predominantly feminine, though historically it could be a shortened form of male names in some contexts. Iro evokes a mood of calm serenity and quiet strength, suggesting a thoughtful personality. Its simplicity and melodic quality contribute to its understated elegance. It’s a name that reflects cultural heritage and a connection to ancient traditions.
| Country | Day | Month | Names |
 Hungary | 18 | January | Piroska |
 Poland | 24 | January | Chwalibóg, Felicja, Mirogniew, Rafaela, Rafał, Tymoteusz |
 Croatia | 1 | February | Brigita, Gita, Miroslav |
 Italy | 9 | February | Girolamo Emiliani |
| Poland | 26 | February | Aleksander, Bogumił, Cezariusz, Dionizy, Mirosław, Nestor |
 Spain | 4 | March | Francisca, Arcadio, Casimiro, Eugenio |
 Bulgaria | 6 | March | Krasimir, Krasimira, Bella, Miroslav, Miroslava |
 Czechia | 6 | March | Miroslav |
| Spain | 11 | March | Ramiro, Oria |
 USA | 11 | March | Alberta, Albertina, Angus, Connie, Constance, Constantine, Consuela, Consuelo, Elberta, Ramiro |
| Spain | 13 | March | Patricia, Rodrigo, Ramiro |
| Spain | 24 | March | Delmiro, Edelmira, Edelmiro, Timolao |
 Slovakia | 29 | March | Miroslav |
| Czechia | 5 | April | Miroslava |
| Slovakia | 5 | April | Miroslava |
 Romania | 8 | April | Agav, Irodion, Lazar, Ruf |
| Romania | 3 | May | Irodion, Mavra, Timotei |
| Bulgaria | 5 | May | Irina, Mira, Irena, Miroslav, Miroslava |
| Bulgaria | 11 | May | Kiril, Kirila, Metodi, Kiro, Kirilka, Metodiy, Metodiya |
| Bulgaria | 24 | May | Kiril, Kirila, Metodi, Kiro, Kirilka, Metodiy, Metodiya |
| Spain | 16 | June | Ciro, Aquilino, Aureliano, Siro, Alina, Regina, Regis |
 Latvia | 19 | June | Nils, Vaironis, Viktors |
| Spain | 29 | June | Ciro, David, Siro, Paola, Pablo, Pedro |
| Slovakia | 3 | July | Miroslav |
| Croatia | 14 | July | Kamilo de Lellis, Miroslav |
| Spain | 14 | July | Camila, Vladimiro, Camilo |
| Poland | 26 | July | Anna, Bartolomea, Grażyna, Mirosława |
| Poland | 4 | August | Alfred, Arystarch, Dominik, Maria, Mironieg, Protazy |
| Romania | 8 | August | Emilian, Miron |
 Greece | 17 | August | Miron, Straton |
| Poland | 17 | August | Anastazja, Angelika, Anita, Bertram, Eliza, Jacek, Jaczewoj, Joanna, Julianna, Liberat, Miron, Żanna, Zawisza |
| Romania | 17 | August | Gheorghe, Miron |
| Poland | 30 | August | Adaukt, Częstowoj, Gaudencja, Miron, Rebeka, Róża, Szczęsna, Szczęsny, Tekla |
 Finland | 7 | September | Miro, Arho, Arhippa, Milo |
| Italy | 30 | September | Girolamo |
| Croatia | 20 | October | Vendelin, Irena, Miroslava |
| Greece | 1 | November | Kosmas, Damianos, Anargiros, David |
 Estonia | 3 | November | Kaido, Kaidu, Kairo, Kaivo, Kaimo, Kaimar |
| Poland | 19 | November | Elżbieta, Mironiega, Paweł, Seweryn, Seweryna |
| Romania | 2 | December | Avacum, Miropia, Porfirie |
| Italy | 9 | December | Siro |
| Bulgaria | 12 | December | Darina, Spiro, Spiridon |
| Greece | 12 | December | Spiros |
| Estonia | 19 | December | Maarius, Mario, Mairo |
| Finland | 19 | December | Iiro, Iisakki, Iikka, Isko |