Iza’s name day is observed on September 13 in Latvia.
Iza is a feminine name primarily used across Europe, often acting as a stylish short form of longer names like Izabela, giving it roots in ancient traditions signifying dedication. While not highly ranked in the USA, its history shows occasional use among specific immigrant groups, aligning with contemporary trends toward short, crisp names. The name projects an elegant and strong mood, characterized by a refined and sophisticated tone. Linguistically, its origin ties it firmly to Slavic and Romance language groups via its longer variants. Iza is classified globally and definitively as a female name. This concise name successfully blends historical depth with modern appeal.
| Country | Day | Month | Names |
 Poland | 4 | January | Angelika, Aniela, Benedykta, Benita, Dobromir, Dobrymir, Eugeniusz, Grzegorz, Izabela, Leonia, Rygobert, Tytus |
 USA | 22 | February | Bella, Belle, George, Georgio, Isabel, Isabela, Isabella, Isabelle, Izabella, Jorge, Miracle |
 Lithuania | 26 | February | Aleksandras, Aurime, Izabele, Jogintas |
| Poland | 15 | March | Gościmir, Heloiza, Klemens, Krzysztof, Longinus, Ludwika |
| Poland | 16 | March | Abraham, Cyriak, Henryka, Herbert, Hiacynt, Hilary, Izabela, Oktawia |
 Czechia | 11 | April | Izabela |
 Greece | 24 | April | Elizabeth, Lisa, Anastasios, Doukas, Achilles, Orthodox Easter |
 Russia | 7 | May | Elizaveta |
 Hungary | 24 | May | Eszter, Eliza |
| Poland | 14 | June | Bazylid, Bazylis, Eliza, Justyn, Justyna, Ninogniew, Walerian, Waleriana |
 Croatia | 4 | July | Elizabeta Portugalska kr., Elza, Berta |
 Spain | 4 | July | Berta, Elizabeth, Laureano, Isabel, Inocencio |
| Poland | 9 | July | Anatolia, Heloiza, Hieronim, Łucja, Lucja, Ludwika, Lukrecja, Mikołaj, Patrycjusz, Weronika, Wszebąd, Zenon, Zenona |
| Hungary | 12 | July | Izabella, Dalma |
| Lithuania | 12 | July | Izabele, Margiris, Vyliaude |
| Poland | 14 | July | Bonawentura, Damian, Dobrogost, Franciszek, Izabela, Kosma, Marceli, Marcelin, Marcelina, Stella, Ulrych, Ulryk, Ulryka |
| Poland | 17 | August | Anastazja, Angelika, Anita, Bertram, Eliza, Jacek, Jaczewoj, Joanna, Julianna, Liberat, Miron, Żanna, Zawisza |
| Croatia | 18 | August | Jelena Križarica, Bl. Manes |
| Poland | 25 | August | Gaudencjusz, Gaudenty, Grzegorz, Ludwik, Luiza, Michał, Sieciesław |
 Latvia | 2 | September | Eliza, Elize, Lizete, Zete |
| Poland | 2 | September | Absalon, Bohdan, Czech, Czechasz, Czechoń, Czesław, Dersław, Dionizy, Eliza, Henryk, Julian, Stefan, Tobiasz, Wilhelm, Witomysł |
| Poland | 3 | September | Antoni, Bartłomiej, Bazylissa, Bronisław, Bronisz, Erazma, Eufemia, Eufrozyna, Izabela, Jan, Joachim, Joachima, Manswet, Mojmir, Szymon, Wincenty, Zenon, Zenona |
 Ukraine | 5 | September | Elizabeth, Raisa, Raya, Zachary |
| Croatia | 14 | September | Uzvišenje sv. Križa, Višeslav |
| Russia | 18 | September | Elizaveta, Raisa |
| Greece | 22 | September | Fokas, Louise, Louiza |
| Latvia | 3 | October | Elza, Gudruna, Ilizana |
| Croatia | 19 | October | Pavao od Križa |
| USA | 27 | October | Cale, Caleb, Feodor, Isaac, Isaak, Issac, Izaac, Kaleb, Ted, Teddy, Teodor, Theodora, Theodore |
| Lithuania | 29 | October | Gelgaudas, Narcizas, Tolvyde, Violeta |
| Poland | 12 | November | Cibor, Czcibor, Izaak, Jonasz, Jozafat, Konradyn, Konradyna, Krystyn, Marcin, Renat, Renata, Witold, Witołd, Witolda |
| Croatia | 17 | November | Elizabeta Ugarska, Igor, Grgur |
| Latvia | 19 | November | Betija, Elizabete, Liza, Lize |
| USA | 19 | November | Bessie, Beth, Betsy, Betty, Elisa, Elisabeth, Elise, Eliza, Elizabeth, Elsa, Elsie, Elyse, Elza, Lisa, Liza, Lizbeth, Lizette |
 Slovakia | 9 | December | Izabela |
| Croatia | 16 | December | Lazar, Izak, Jolanda, Florijan |