Una celebrates its name day on March 21 in Latvia, April 15 in Austria, and May 4 in Ukraine.
Una is a name found throughout the United States and various European countries, often appreciated for its minimalist and elegant sound. It has deep historical roots in Latin and Irish naming traditions, generally carrying connotations related to unity. The name is classified as feminine and is recognized for a soft, serene, and nature-like personality. In many regions, it is viewed as a vintage yet timeless choice that avoids being overly trendy. Its simplicity and clarity contribute to its lasting popularity across different cultures. The name continues to be a favored option for those seeking a name with grace and historical depth.
| 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