Una's name day is celebrated on March 21 in Latvia, April 15 in Austria, and May 4 in Ukraine.
In the USA, Una is a rare and elegant name, often perceived as soft and romantic. Its origins are primarily Celtic and Latin, meaning "one" or "unity." This suggests a sense of singularity and wholeness, contributing to its sophisticated and understated charm. While technically a feminine name, its uncommonness can lend it a timeless and almost ethereal quality. The mood associated with Una is generally peaceful and contemplative.
| Country | Day | Month | Names |
 Lithuania | 24 | January | Arturas, Felicija, Gaivile, Marvydas, Sarunas, Vilgaudas |
| Lithuania | 19 | February | Konradas, Nida, Sarunas, Zuzana |
 Poland | 21 | February | Eleonora, Feliks, Fortunat, Kiejstut, Teodor, Wyszeniega |
| Lithuania | 27 | February | Fortunatas, Gabrielius, Ginvilas, Skirmante |
| Lithuania | 17 | March | Gendvilas, Gertruda, Patrikas, Varuna, Vyte |
 Bulgaria | 25 | March | Blagovest, Blagovesta, Blagoi, Blaga, Blago, Blaguna, Bonka, Boncho, Marian, Mariana, Blazhe, Evangelina, Vangel, Dobri, Dobrina, Dobrinka |
| Bulgaria | 28 | May | Sotir, Spas, Spaska, Spasena, Spasuna |
| Poland | 1 | June | Alfons, Alfonsyna, Bernard, Fortunat, Gracjana, Hortensjusz, Jakub, Konrad, Konrada, Magdalena, Nikodem, Świętopełk, Symeon |
 Norway | 2 | June | Runa, Runar, Rune |
| Lithuania | 8 | June | Eiginte, Merunas, Moderdas |
| Lithuania | 12 | June | Anupras, Dove, Kristijonas, Kristis, Ramunas |
 USA | 23 | June | Audra, Audrey, Dashawn, Deshawn, Elton, Ethel, Josiah, Josias, Shaina, Shania, Shaun, Shauna, Shawn, Shawna, Shayna, Shayne, Shonda |
 Latvia | 26 | June | Ausma, Dzejs, Inguna, Inguns, Ulvis |
 Finland | 15 | July | Rauna, Rauni |
| Lithuania | 30 | August | Adauktas, Auguna, Gaudencija, Kintenis |
| Latvia | 3 | October | Elza, Gudruna, Ilizana |
| Lithuania | 14 | October | Fortunata, Kalikstas, Mindaugas, Rimvyde |
| Poland | 14 | October | Alan, Bernard, Dominik, Dzierżymir, Fortunata, Kalikst, Kaliksta |
| USA | 14 | October | Calista, Dwight, Fortino, Fortuna, Glennis, Glynnis |
| Finland | 16 | October | Sirkka, Sirkku, Luna, Stella |
| Latvia | 29 | October | Elva, Elvijs, Fortuna, Laimonis |
| Latvia | 8 | December | Guna, Gunars, Marieta, Vladimirs |
| Latvia | 10 | December | Cera, Guna, Judite, Sniedze |
| Poland | 15 | December | Celina, Fortunata, Iga, Ignacja, Ignacy, Krystiana, Nina, Walerian, Waleriana, Wolimir, Żegota |
 Spain | 15 | December | Fortunato, Cristina |
Austria 
Ukraine